EXECUTIVE EMPLOYMENT AGREEMENT
 
 
         THIS AGREEMENT, is made and entered into this 4th day of May, 1999 (the
"Effective Date"), by and between KENNAMETAL INC., a corporation organized under
the laws of the Commonwealth of Pennsylvania, for and on behalf of itself and on
behalf of its subsidiary companies (hereinafter referred to as "Kennametal"),
and Markos I. Tambakeras, an individual (hereinafter referred to as "Employee");
 
                                   WITNESSETH:
 
         WHEREAS, Kennametal and the Employee desire to enter into this
Agreement in order to set forth the terms and conditions of Employee's
employment with Kennametal; and
 
         WHEREAS, Employee acknowledges that by reason of employment by
Kennametal, it is anticipated that Employee will work with, add to, create, have
access to and be entrusted with trade secrets and confidential information
belonging to Kennametal which are of a technical nature or business nature or
pertain to future developments, the disclosure of which trade secrets or
confidential information would be highly detrimental to the interests of
Kennametal;
 
         NOW, THEREFORE, Kennametal and Employee, each intending to be legally
bound hereby, do mutually covenant and agree as follows:
 
         1.       (a) Kennametal hereby agrees to employ the Employee and the
Employee hereby agrees to be employed by the Company commencing on July 1, 1999
for the Term (as hereinafter defined) of the Agreement, in the position and with
the duties and responsibilities set forth in paragraph 1(b) below, and upon the
other terms and subject to the conditions hereinafter stated.
 
                  (b) During the Term, the Employee shall serve as the President
and Chief Executive Officer of Kennametal and a member of the Board of
Directors. The Employee shall have general executive supervision over the
business and affairs of Kennametal, subject to the policies and directions of,
and the executive responsibilities that may be assigned to him (which in each
case shall be consistent with his position and title) by the Board of Directors
of Kennametal (the "Board of Directors"). The Employee shall generally be
responsible for supervising the development, coordination and implementation of
the strategies for Kennametal's business. Employee's duties shall be performed
principally at Kennametal's executive offices which are located in the Latrobe,
Pennsylvania area. A demotion in Employee's position will be considered
termination without Cause (as defined herein) by Kennametal.
 
                  (c) The Employee shall devote his full time and attention to
the business and affairs of Kennametal; provided, however, that nothing
contained herein shall prohibit the Employee from (a) serving as a member of the
Board of Directors of any other for-profit entity so long as Employee has
obtained the prior consent of Board of Directors, or (b) engaging in charitable
and community affairs.
 
 
<PAGE>   2
 
                  (d) The term of this Agreement shall be for a period of three
(3) years, commencing on July 1, 1999 and ending on June 30, 2002 (the "Term").
 
                  (e) For the services rendered by Employee to Kennametal during
the Term, the Employee shall be paid the compensation and receive the benefits
as follows:
 
                           (i) Employee shall be entitled to receive a salary at
the rate of $550,000 per annum, payable in accordance with Kennametal's payroll
practices ("Base Salary");
 
                           (ii) Employee shall receive a sign-on bonus of
$300,000 which will be paid to Employee not later than August 31, 1999;
 
                           (iii) During the three years ended June 30, 2002,
Employee shall be eligible to receive future bonuses of not less than $300,000
per annum under Kennametal's bonus plan for executive officers;
 
                           (iv) Employee shall receive stock options covering
150,000 shares of the Capital Stock of Kennametal, priced prior to the public
announcement of Employee's position with Kennametal, and under the terms and
conditions and pursuant to the Stock Option Agreement in the form of Exhibit A
attached hereto;
 
                           (v) Employee shall receive, as of the Effective Date,
a restricted stock grant for 83,000 shares of Capital Stock under the terms and
conditions and pursuant to the Restricted Stock Agreement in the form of Exhibit
B attached hereto; and
 
                           (vi) Kennametal agrees to provide Employee with
pension benefits in an amount not less than the following benefits (in the event
that the benefits Employee would receive under Kennametal's pension plans would
exceed the following benefits, Employee will receive those amounts instead of
the following benefits):
 
                                    (A) If Employee is terminated by Kennametal
without Cause, by Employee for Employer's Breach (as defined herein) or by
Employee at or after age 60, in any year set forth in Column A of Schedule I
attached hereto, then Employee will be entitled to receive from Kennametal the
Lump Sum Amount (as hereinafter defined) equal to the annual benefit set forth
in the row in Column B of Schedule I corresponding to the row in Column A of the
year of termination; and
 
                                    (B) If Employee voluntarily terminates his
employment with Kennametal after four or more years of service in any year set
forth in Column A of Schedule I attached hereto, then Employee will be entitled
to receive from Kennametal the Lump Sum Amount equal to one-half of the annual
benefit set forth in the row in Column B of Schedule I corresponding to the row
in Column A of the year of termination.
 
                           "Lump Sum Amount" shall mean a single payment amount
equal to the present value of the relevant annual benefit determined in
accordance with the actuarial methods and assumptions used by the Pension
Benefit Guaranty Corporation for valuing immediate annuity contracts reduced by
the present value, determined in accordance with such methods, of any benefit
provided to Employee under Kennametal's other pension benefit plans.
 
 
<PAGE>   3
 
         2. In addition to the compensation set forth or contemplated elsewhere
herein, Employee, subject to the terms and conditions of this Agreement, shall
be entitled to participate in all group insurance programs, retirement income
(pension) plans, thrift plans and vacation and holiday programs normally
provided for other executives of Kennametal. Nothing herein contained shall be
deemed to limit or prevent Employee, during his employment hereunder, from being
reimbursed by Kennametal for out-of-pocket expenditures incurred for travel,
lodging, meals, entertainment expenses or any other expenses in accordance with
the policies of Kennametal applicable to the executives of Kennametal.
 
         3. Employee's employment may be terminated with or without any reason
for termination by either party hereto at any time by giving the other party
prior written notice thereof; provided, however, that any termination on the
part of Kennametal shall occur only if specifically authorized by its Board of
Directors; provided further, however, that termination by Kennametal for Cause
shall be made by written notice which states that it is a termination for Cause;
and provided further, however, that termination by Employee, other than
termination for Good Reason (as hereinafter defined) following a
Change-in-Control (as hereinafter defined), shall be on not less than 30 days
prior written notice to Kennametal.
 
         4. (a)      (i) In the event that Employee's employment is terminated
during the Term by Kennametal prior to a Change-in-Control and other than for
Cause, or by Employee for Employer's Breach, Employee will receive as severance
pay, in addition to all amounts due him at the Date of Termination (as
hereinafter defined), a lump sum payment equal to the greater of: (A) the amount
of Base Salary and any bonuses that Employee would have earned during the Term
under Kennametal bonus plans then in effect had Employee been employed by
Kennametal as its President and Chief Executive Officer for the full Term and
had plan been met for each period during the Term, or (B) the amount equal to
two (2) times (y) Base Salary plus Employee's targeted bonus (but not less than
60% of Base Salary) for the year in which the Date of Termination occurs.
Additionally, the stock options and restricted stock granted to Employee under
paragraphs 1(e)(iv) and (v) will vest immediately upon the occurrence of the
events stated above in this paragraph 4(a)(i). All amounts will be paid within
five (5) business days after such termination.
 
         "Employer's Breach" shall be defined as a material breach of this
Agreement by Kennametal, including specifically any reduction in Employee's
position, authority or responsibility.
 
                           (ii) In the event that Employee's employment is
terminated after the Term by Kennametal prior to a Change-in-Control and other
than for Cause, Employee will receive as severance pay, in addition to all
amounts due him at the Date of Termination, an amount, payable promptly after
the Date of Termination, equal to two years' annual base salary at the rate then
in effect on the Date of Termination plus Employee's targeted bonus (but not
less than 60% of then base salary) for the year in which the Date of Termination
occurs.
 
                  (b) In the event that Employee's employment is terminated by
Employee without Good Reason following a Change-in-Control (as hereinafter
defined) or prior to a Change-in-Control other than for Employer's Breach,
Employee will not be entitled to receive any severance pay other than the
amounts, if any, due him at the Date of Termination.
 
 
<PAGE>   4
 
                  (c) In the event that, at or after a Change-in-Control and
prior to the third anniversary of the date of the Change-in-Control, Employee's
employment is terminated by Employee for Good Reason or by Kennametal other than
for Cause or Disability pursuant to paragraph 5, then Employee will receive as
severance pay (in addition to all other amounts due him at the Date of
Termination) an amount equal to the product of:
 
                           (i)      three (3)
                  times
 
                           (ii)     the sum of
 
                                    (x)      Employee's Base Salary at the
                                             annual rate in effect on the Date
                                             of Termination (or, at Employee's
                                             election, at the annual rate in
                                             effect on the first day of the
                                             calendar month immediately prior to
                                             the Change-in-Control), plus
 
                                    (y)      Employee's targeted bonus (but not
                                             less than 60% of then base salary)
                                             for the year in which the Date of
                                             Termination occurs.
 
                           Such severance pay shall be paid by delivery of a
cashier's or certified check to the Employee at Kennametal's executive offices
on a date which is no later than five (5) business days following the Date of
Termination.
 
                           If there is a Change-in-Control, and if Employee
elects to terminate his employment for any reason or no reason during the thirty
(30) day period commencing twelve (12) months after the date of the
Change-in-Control, the Employee shall be paid severance benefits as though
Employee had been terminated by Kennametal without Cause.
 
                           In addition to the severance payments provided for in
this paragraph 4(c), Employee also will receive the same or equivalent medical,
dental, disability and group insurance benefits as were provided to the Employee
at the Date of Termination, which benefits shall be provided to Employee for a
three year period commencing on the Date of Termination. The Employee shall also
be deemed and shall be credited for computing benefits, for vesting and for all
other purposes under any pension or retirement income plan of Kennametal
(including any supplemental retirement plan) to have continuously remained in
the employment of Kennametal for the three year period following the Date of
Termination at an annual compensation equal to the sum of the base salary and
bonus which were used to compute the payment due the Employee under the first
paragraph of this paragraph 4(c).
 
                  (d) If for any reason, whether by law or provisions of
Kennametal's employee medical, dental or group insurance, pension or retirement
plan or other benefit plans, any benefits which the Employee would be entitled
to under the foregoing paragraph 4(c) cannot be paid pursuant to such employee
benefit plans, then Kennametal hereby contractually agrees to pay to the
Employee the difference between the benefits which the Employee would have
received in accordance with the foregoing paragraph 4(c) if the relevant
employee medical,
 
 
<PAGE>   5
 
dental or group insurance or pension or retirement plan or other benefit plan
could have paid such benefit and the amount of benefits, if any, actually paid
by such employee medical, dental or group insurance or pension or retirement
plan or other benefit plan. Kennametal shall not be required to fund its
obligation to pay the foregoing difference.
 
                  (e) In the event of a termination of employment under the
circumstances described above in paragraph 4(a) or paragraph 4(c), Employee
shall have no duty to seek any other employment after termination of Employee's
employment with Kennametal and Kennametal hereby waives and agrees not to raise
or use any defense based on the position that Employee had a duty to mitigate or
reduce the amounts due him hereunder by seeking other employment whether
suitable or unsuitable and should Employee obtain other employment, then the
only effect of such on the obligations of Kennametal hereunder shall be that
Kennametal shall be entitled to credit against any payments which would
otherwise be made for medical, dental or group insurance or similar benefits
(excluding, however, any credit against Kennametal payments relating to pension
or retirement benefits including under any supplemental retirement plan)
pursuant to the benefit provisions set forth in paragraph 4(c) hereof, any
comparable payments to which Employee is entitled under the employee benefit
plans maintained by Employee's other employer or employers in connection with
services to such employer or employers after termination of his employment with
Kennametal.
 
                  (f) The term "Change-in-Control" shall mean a change in
control of a nature that would be required to be reported in response to Item
6(e) of Schedule 14A promulgated under the Securities Exchange Act of 1934 as in
effect on the date hereof ("1934 Act"), or if Item 6(e) is no longer in effect,
any regulations issued by the Securities and Exchange Commission pursuant to the
1934 Act which serve similar purposes; provided that, without limitation, such a
change in control shall be deemed to have occurred if (A) Kennametal shall be
merged or consolidated with any corporation or other entity other than a merger
or consolidation with a corporation or other entity all of whose equity
interests are owned by Kennametal immediately prior to the merger or
consolidation, or (B) Kennametal shall sell all or substantially all of its
operating properties and assets to another person, group of associated persons
or corporation, or (C) any "person" (as such term is used in Sections 13(d) and
14(d) of the 1934 Act), is or becomes a beneficial owner, directly or
indirectly, of securities of Kennametal representing 25% or more of the combined
voting power of Kennametal's then outstanding securities coupled with or
followed by the existence of a majority of the board of directors of Kennametal
consisting of persons other than persons who either were directors of Kennametal
immediately prior to or were nominated by those persons who were directors of
Kennametal immediately prior to such person becoming a beneficial owner,
directly or indirectly, of securities of Kennametal representing 25% or more of
the combined voting power of Kennametal's then outstanding securities.
 
                  (g) For purposes of this agreement "Date of Termination" shall
mean:
 
                           (i) if Employee's employment is terminated due to his
death or retirement, the date of death or retirement, respectively; or
 
                           (ii) if Employee's employment is terminated for any
other reason, the date on which the termination becomes effective as stated in
the written notice of termination
 
 
<PAGE>   6
 
 
given to or by the Employee or, if no written notice is given, the date
determined by Kennametal in good faith.
 
                  (h) The term "Good Reason" for termination by the Employee
shall mean the occurrence of any of the following at or after a
Change-in-Control:
 
                           (i) without the Employee's express written consent,
the assignment to the Employee of any duties materially and substantially
inconsistent with his positions, duties, responsibilities and status with
Kennametal immediately prior to a Change-in-Control, or a material change in his
reporting responsibilities, titles or offices as in effect immediately prior to
a Change-in-Control, or any removal of the Employee from or any failure to
re-elect the Employee to any of such positions, except in connection with the
termination of the Employee's employment due to Cause or as a result of the
Employee's death;
 
                           (ii) a reduction by Kennametal in the Employee's base
salary as in effect immediately prior to any Change-in-Control;
 
                           (iii) a failure by Kennametal to continue to provide
incentive compensation, under the rules by which incentives are provided,
comparable to that provided by Kennametal immediately prior to any
Change-in-Control;
 
                           (iv) the failure by Kennametal to continue in effect
any benefit or compensation plan, stock option plan, pension plan, life
insurance plan, health and accident plan or disability plan in which Employee is
participating immediately prior to a Change-in-Control (provided, however, that
there shall not be deemed to be any such failure if Kennametal substitutes for
the discontinued plan, a plan providing Employee with substantially similar
benefits) or the taking of any action by Kennametal which would adversely affect
Employee's participation in or materially reduce Employee's benefits under any
of such plans or deprive Employee of any material fringe benefit enjoyed by
Employee immediately prior to a Change-in-Control;
 
                           (v) the failure of Kennametal to obtain the
assumption of this Agreement by any successor as contemplated in paragraph 11
hereof;
 
                           (vi) the relocation of the Employee to a facility or
a location more than 50 miles from the Employee's then present location, without
the Employee's prior written consent; or
 
                           (vii) any purported termination of the employment of
Employee by Kennametal which is not for Cause as provided in paragraph 5.
 
         5. In the event that Employee
 
                  (a) shall be guilty of malfeasance, willful misconduct or
gross negligence in the performance of the services contemplated by this
Agreement;
 
                  (b) shall willfully, deliberately and continually fail to
perform his duties or to implement the policies or directives of the Board of
Directors;
 
 
<PAGE>   7
 
                  (c) shall not make his services available to Kennametal on a
full time basis in accordance with paragraph 1 hereof for any reason (excluding
Disability) prior to termination other than arising from Employee's incapacity
due to physical or mental illness or injury which does not constitute
Disability;
 
                  (d) shall breach the provisions of paragraph 8 of this
Agreement; or
 
                  (e) shall be convicted of a felony.
 
                           (each of the matters described in subparagraphs (a),
(b), (c), (d) and (e)) above shall be "Cause"), Kennametal shall have the right,
exercised by resolution adopted by a majority of its Board of Directors, to
terminate Employee's employment for Cause by giving prior written notice to
Employee of its election so to do.
 
                  In that event, Employee's employment shall be deemed
terminated for Cause, Kennametal shall not be obligated to pay and Employee
shall not be entitled to the benefits set forth in paragraphs 1 and 4; provided,
however, that Kennametal shall have the obligation to pay Employee the unpaid
portion of Employee's base salary for the period from the last period from which
Employee was paid to the Date of Termination; provided further, however, that if
Employee's employment is terminated as a result of the Disability of Employee,
the benefits set forth in paragraphs 1 and 4 shall not be paid or payable but
Employee shall be entitled to receive the annual supplement under the
supplemental retirement plan and Employee's employment by Kennametal shall not
be deemed terminated for purposes of the Long-Term Disability Plan, Retirement
Income Plan for US Salaried Employees or any other benefit plan which so
provides.
 
                  For purposes of this agreement "Disability" shall mean such
incapacity due to physical or mental illness or injury which results in the
Employee's being absent from his principal office at Kennametal's offices for
the entire portion of 180 consecutive business days. "Cause" shall not be deemed
to include opposition by Employee to a Change-in-Control or any matter
incidental thereto and any determination by the Board of Directors that "Cause"
existed shall not be final or binding upon the Employee or his rights hereunder
or entitled to any deference in any court or other tribunal.
 
         6. Kennametal agrees to indemnify Employee from his net losses arising
from Section 4(c) of Exhibit A to that certain Stock Option Agreement dated
February 17, 1998 or any such similar provisions contained in any stock options
granted to Employee. In the event Employee's current employer cancels or
otherwise refuses to honor Employee's currently vested stock options, Kennametal
will immediately pay Employee, in cash, an amount equal to the amount by which
the fair market value of the option shares (measured as of the date of
Employee's termination from his current employer) exceeds the option exercise
price on such options. In consideration of the foregoing, Employee will use his
reasonable best efforts to prevent any such loss and, so long as Kennametal
agrees to pay the costs of such, to contest and assist Kennametal in contesting
any such potential loss. It is expected that Employee will, within his
employment period with his current employer, exercise all vested options and
sell the shares received upon such exercises.
 
         7. Nothing herein contained shall affect the right of Employee to
participate in and receive benefits under and in accordance with the then
current provisions of any retirement
 
 
 
<PAGE>   8
 
income, profit-sharing, additional year-end or periodic remuneration or bonus,
incentive compensation, insurance or any other employee welfare plan or program
of Kennametal and all payments hereunder shall be in addition to any benefits
received thereunder (including long term disability payments).
 
         8. During the period of employment of Employee by Kennametal and for
three years thereafter (provided, however, that this paragraph 8 shall not apply
to the Employee following a termination of Employee's employment (x) if a
Change-in-Control shall have occurred prior to the Date of Termination or (y) if
Employee's employment is terminated by Kennametal other than for Cause or by
Employee due to Employer's Breach), Employee will not, in any geographic area in
which Kennametal is offering its services and products, without the prior
written consent of Kennametal:
 
                           (a) directly or indirectly engage in, or
 
                           (b) assist or have an active interest in (whether as
proprietor, partner, investor, shareholder, officer, director or any type of
principal whatsoever), or
 
                           (c) enter the employ of, or act as agent for, or
advisor or consultant to, any person, firm, partnership, association,
corporation or business organization, entity or enterprise which is or is about
to become directly or indirectly engaged in, any business which is competitive
with any business of Kennametal or any subsidiary or affiliate thereof in which
Employee is or was engaged; provided, however, that the foregoing provisions of
this paragraph 8 are not intended to prohibit and shall not prohibit Employee
from purchasing, for investment, not in excess of 1% of any class of stock or
other corporate security of any company which is registered pursuant to Section
12 of the Securities Exchange Act of 1934.
 
                  Employee acknowledges that the breach by him of the provisions
of this paragraph 8 would cause irreparable injury to Kennametal, acknowledges
and agrees that remedies at law for any such breach will be inadequate and
consents and agrees that Kennametal shall be entitled, without the necessity of
proof of actual damage, to injunctive relief in any proceedings which may be
brought to enforce the provisions of this paragraph 8. Employee acknowledges and
warrants that he will be fully able to earn an adequate livelihood for himself
and his dependents if this paragraph 8 should be specifically enforced against
him and that such enforcement will not impair his ability to obtain employment
commensurate with his abilities and fully acceptable to him.
 
                  If the scope of any restriction contained in this paragraph 8
is too broad to permit enforcement of such restriction to its full extent, then
such restriction shall be enforced to the maximum extent permitted by law and
Employee and Kennametal hereby consent and agree that such scope may be
judicially modified in any proceeding brought to enforce such restriction.
 
         9. (a) Employee acknowledges and agrees that in the course of his
employment by Kennametal, Employee may work with, add to, create or acquire
trade secrets and confidential information ("Confidential Information") which
could include, in whole or in part, information:
 
 
<PAGE>   9
 
                           (i) of a technical nature such as, but not limited
to, Kennametal's manuals, methods, know-how, formulae, shapes, designs,
compositions, processes, applications, ideas, improvements, discoveries,
inventions, research and development projects, equipment, apparatus, appliances,
computer programs, software, systems documentation, special hardware, software
development and similar items; or
 
                           (ii) of a business nature such as, but not limited
to, information about business plans, sources of supply, cost, purchasing,
profits, markets, sales, sales volume, sales methods, sales proposals, identity
of customers and prospective customers, identity of customers' key purchasing
personnel, amount or kind of customers' purchases and other information about
customers; or
 
                           (iii) pertaining to future developments such as, but
not limited to, research and development or future marketing or merchandising.
 
                  Employee further acknowledges and agrees that (i) all
Confidential Information is the property of Kennametal; (ii) the unauthorized
use, misappropriation or disclosure of any Confidential Information would
constitute a breach of trust and could cause irreparable injury to Kennametal;
and (iii) it is essential to the protection of Kennametal's goodwill and to the
maintenance of its competitive position that all Confidential Information be
kept secret and that Employee not disclose any Confidential Information to
others or use any Confidential Information to the detriment of Kennametal.
 
                  Employee agrees to hold and safeguard all Confidential
Information in trust for Kennametal, its successors and assigns and Employee
shall not (except as required in the performance of Employee's duties), use or
disclose or make available to anyone for use outside Kennametal's organization
at any time, either during employment with Kennametal or subsequent thereto, any
of the Confidential Information, whether or not developed by Employee, without
the prior written consent of Kennametal.
 
                  (b) Employee agrees that:
 
                           (i) he will promptly and fully disclose to Kennametal
or such officer or other agent as may be designated by Kennametal any and all
inventions made or conceived by Employee (whether made solely by Employee or
jointly with others) during employment with Kennametal (A) which are along the
line of the business, work or investigations of Kennametal, or (B) which result
from or are suggested by any work which Employee may do for or on behalf of
Kennametal; and
 
                           (ii) he will assist Kennametal and its nominees
during and subsequent to such employment in every proper way (entirely at its or
their expense) to obtain for its or their own benefit patents for such
inventions in any and all countries; the said inventions, without further
consideration other than such salary as from time to time may be paid to him by
Kennametal as compensation for his services in any capacity, shall be and remain
the sole and exclusive property of Kennametal or its nominee whether patented or
not; and
 
                           (iii) he will keep and maintain adequate and current
written records of all such inventions, in the form of but not necessarily
limited to notes, sketches, drawings, or
 
 
<PAGE>   10
 
reports relating thereto, which records shall be and remain the property of and
available to Kennametal at all times.
 
                  (c) Employee agrees that, promptly upon termination of his
employment, he will disclose to Kennametal, or to such officer or other agent as
may be designated by Kennametal, all inventions which have been partly or wholly
conceived, invented or developed by him for which applications for patents have
not been made and shall thereafter execute all such instruments of the character
hereinbefore referred to, and will take such steps as may be necessary to secure
and assign to Kennametal the exclusive rights in and to such inventions and any
patents that may be issued thereon any expense therefor to be borne by
Kennametal.
 
                  (d) Employee agrees that he will not at any time aid in
attacking the patentability, scope, or validity of any invention to which the
provisions of subparagraphs (b) and (c), above, apply.
 
         10. In the event that (a) Employee institutes any legal action to
enforce his rights under, or to recover damages for breach of this Agreement, or
(b) Kennametal institutes any action to avoid making any payments due to
Employee under this Agreement, Employee, if he is the prevailing party, shall be
entitled to recover from Kennametal any actual expenses for attorney's fees and
other disbursements incurred by him in relation thereto. Except as set forth
above, Employee's sole and exclusive remedy for breach of this Agreement by
Kennametal shall be recovery of the amounts due to Employee for Employer's
Breach in paragraphs 1(e)(vi) and 4(a)(i) and 4(c). Employee acknowledges that
Employee's actual damages in the event of Employer's Breach would be difficult
to determine and that such amount is a reasonable amount of liquidated damages
for any such Employer's Breach.
 
         11. The terms and provision of this Agreement shall be binding upon,
and shall inure to the benefit of, Employee and Kennametal, it subsidiaries and
affiliates and their respective successors and assigns.
 
         12. This Agreement constitutes the entire Agreement between the parties
hereto and supersedes all prior agreements and understandings, whether oral or
written, among the parties with respect to the subject matter hereof. This
Agreement may not be amended orally, but only by an instrument in writing signed
by each of the parties to this Agreement.
 
         13. The invalidity or unenforceability of any provision of this
Agreement shall not affect the other provisions hereof, and this Agreement shall
be construed in all respects as if such invalid or unenforceable provision were
omitted.
 
         14. Any pronoun and any variation thereof used in this agreement shall
be deemed to refer to the masculine, feminine, neuter, singular or plural, as
the identity of the parties hereto may require.
 
         15. Kennametal shall be entitled as a condition to paying any severance
pay or providing any benefits hereunder upon a termination of the Employee's
employment to require the Employee to deliver on or before the making of any
severance payment or providing of any benefit a release in the form of Exhibit C
attached hereto.
 
 
<PAGE>   11
 
         16. (a) During the Term, any payments under this Agreement or any other
payments or benefits received or to be received by Employee in connection with a
change in control of Kennametal, Employee's termination of employment, or
Employee's cessation of active service (whether pursuant to the terms of this
Agreement or any other plan, arrangement or agreement with Kennametal, or any
person affiliated with Kennametal) (the "Severance Payments") will be subject to
the tax (the "Excise Tax") imposed by section 4999 of the Internal Revenue Code
of 1986, as amended (the "Code"), or any similar tax that may hereafter be
imposed, Kennametal shall pay to Employee, at the time specified below, an
additional amount (the "Excise Tax Payment") such that the amount retained by
Employee, after deduction of any Excise Tax on the Severance Payments and any
federal, state and local income tax and Excise Tax upon the payment provided for
by this paragraph 16(a), but not including any deduction for federal, state or
local income tax on the original amount of the Severance Payments, shall be
equal to the Severance Payments.
 
                           For purposes of determining whether any of the
Severance Payments will be subject to the Excise Tax and the amount of such
Excise Tax, (i) all Severance Payments shall be treated as "parachute payments"
within the meaning of Section 280G(b)(2) of the Code, and all "excess parachute
payments" within the meaning of Section 280G(b)(1) shall be treated as subject
to the Excise Tax, unless in the opinion of tax counsel selected by the Board of
Directors, such Severance Payments (in whole or in part) do not constitute
parachute payments, or such excess parachute payments (in whole or in part)
represent reasonable compensation for services actually rendered within the
meaning of Section 280G(b)(4) of the Code in excess of the base amount within
the meaning of Section 280G(b)(3) of the Code, or are otherwise not subject to
the Excise Tax, (ii) the amount of the Severance Payments which shall be treated
as subject to the Excise Tax shall be equal to the lesser of (A) the total
amount of the Severance Payments or (B) the amount of excess parachute payments
within the meaning of Section 280G(b)(1) (after applying clause (i), above), and
(iii) the value of any non-cash benefits or any deferred payment or benefit
shall be determined by Kennametal's independent auditors in accordance with the
principles of Section 280G(d)(3) and (4) of the Code.
 
                           For purposes of determining the amount of the Excise
Tax Payment, Employee shall be deemed to pay federal income taxes at Employee's
highest marginal rate of federal income taxation in the calendar year in which
the Excise Tax Payment is to be made and state and local income taxes at
Employee's highest marginal rate of taxation in the state and locality of
Employee's residence on the Date of Termination (or earlier cessation of
Employee's active service), net of the maximum reduction in federal income taxes
which could be obtained from deduction of such state and local taxes.
 
                           In the event that the Excise Tax is subsequently
determined to be less than the amount taken into account hereunder at the time
of termination of Employee's employment (or earlier cessation of Employee's
active service), Employee shall repay to Kennametal at the time that the amount
of such reduction in Excise Tax is finally determined the portion of the Excise
Tax Payment attributable to such reduction (plus the portion of the Excise Tax
Payment attributable to the Excise Tax and federal and state and local income
tax imposed on the Excise Tax Payment being repaid by Employee if such repayment
results in a reduction in Excise Tax and/or a federal and state and local income
tax deduction) plus interest on the amount of such
 
 
<PAGE>   12
 
repayment from the date the Excise Tax Payment was initially made to the date of
repayment at the rate provided in Section 1274(b)(2)(B) of the Code (the
"Applicable Rate").
 
                           In the event that the Excise Tax is determined to
exceed the amount taken into account hereunder at the time of the termination of
Employee's employment or earlier cessation of Employee's active service
(including by reason of any payment the existence or amount of which cannot be
determined at the time of the Excise Tax Payment), Kennametal shall make an
additional Excise Tax Payment in respect of such excess (plus any interest
payable with respect to such excess) at the time that the amount of such excess
is finally determined. Any payment to be made to Employee under this paragraph
shall be payable within five (5) business days of Employee's Date of Termination
(or within five (5) business days of Employee's earlier cessation of active
service).
 
                  (b) (i) After the Term, notwithstanding any other provision of
this Agreement, in the event that any payment or benefit received, or to be
received, by Employee in connection with a change in control of Kennametal, or
the termination of the Employees' employment (whether pursuant to the terms of
this Agreement or any other plan, arrangement or agreement with Kennametal, any
person whose actions result in a change in control or any person affiliated with
Kennametal or such person), as provided by paragraph 16(a) (collectively, the
"Total Payments"), would not be deductible, in whole or in part, by Kennametal,
an affiliate or other person making such payment or providing such benefit as a
result of Section 28OG of the Code, the payments due under this Agreement (the
"Contract Payments") shall be reduced until no portion of the Total Payments is
not deductible, or the Contract Payments are reduced to zero. In the event that
Kennametal determines that the Total Payments would not be deductible, in whole
or part, as a result of Section 28OG of the Code, Kennametal shall immediately
notify Employee of this determination and the amount which would not be so
deductible as well as a computation of Total Payments. Employee shall have five
(5) business days after receipt of the foregoing notice and computation to waive
in writing all or any portion of any of the Total Payments and any portion of
the Total Payments, the receipt or enjoyment of which Employee shall have
effectively waived in writing, shall not be taken into account. If Kennametal
had already withheld any Contract Payments prior to receipt of such waiver,
Kennametal upon receipt of such waiver shall immediately pay to Employee any
withheld Contract Payments which would have been paid had Kennametal had the
Employee's written waiver prior to the date Kennametal withheld any such
payments.
 
                           (ii) For purposes of the limitation described in this
paragraph 16(b):
 
                                    (A) no portion of the Total Payments shall
be taken into account which in the opinion of tax counsel selected by the Board
of Directors does not constitute a "parachute payment" within the meaning of
Section 28OG(b)(2) of the Code,
 
                                    (B) the Contract Payments shall be reduced
only to the extent necessary so that the Total Payments (other than those
Contract Payments which are waived in writing by the Employee or referred to in
clause (b)) in their entirety constitute reasonable compensation for services
actually rendered within the meaning of Section 28OG(b)(4) of the Code or are
otherwise not subject to disallowance as deductions, in the opinion of the tax
counsel referred to in clause (a); and
 
 
 
<PAGE>   13
 
 
 
                                    (C) the value of any non-cash benefit or any
deferred payment or benefit included in the Total Payments shall be determined
by Kennametal's independent auditors in accordance with the principles of
Section 28OG(d)(3) and (4) of the Code.
 
         17. This agreement shall be governed by the laws of the Commonwealth of
Pennsylvania without regard to its conflict or choice of law provisions.
 
         WITNESS the due execution hereto the day and year first above written.
 
WITNESS:                                    KENNAMETAL INC.
 
 
         /s/  Ronald Basso                  By:      /s/  William R. Newlin
- -------------------------------                -------------------------------
                                                    Chairman of the Board
 
 
WITNESS:                                    EMPLOYEE:
 
 
 
         /s/  Carie Blake                            /s/  Markos I. Tambakeras
- -------------------------------                -------------------------------
                                                     Markos I. Tambakeras
Amendment to Employment Agreement
March 3, 2000
 
Mr. Markos I. Tambakeras
77 North Woodland Road
Pittsburgh, PA 15232
 
Re:  Pension Benefits
 
Dear Mr. Tambakeras:
 
Reference is hereby made to your Executive Employment Agreement dated as of May
4, 1999 with Kennametal Inc.
 
Each of the amounts set forth in Column B on Schedule I, the Supplemental
Benefit Table, of your Executive Employment Agreement is hereby increased by
$96,896. Your Executive Employment Agreement remains in full force and effect in
all other respects.
 
Please indicate your acceptance to this change in your Executive Employment
Agreement by signing below.
 
                                        Very truly yours,
 
                                        KENNAMETAL INC.
 
                                        By: /s/ William R. Newlin
                                           -------------------------------------
                                            Authorized Officer
 
        /s/ Markos I. Tambakeras
   ----------------------------------
          Markos I. Tambakeras