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                                   FORM 11-K


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                 ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                  For the fiscal year ended December 31, 1999

                         Commission File Number: 1-5318


A. Full title of the plan and the address of the plan, if different from that of
the issuer named below:

                           THE KENNAMETAL THRIFT PLAN


B. Name of issuer of the securities held pursuant to the plan and the address of
its principal executive office:

                                Kennametal Inc.
                              1600 Technology Way
                                  P.O. Box 231
                          Latrobe, Pennsylvania 15650



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                           THE KENNAMETAL THRIFT PLAN
                          INDEX TO FINANCIAL STATEMENTS




                                                                                                                  Page
                                                                                                                  ----
                                                                                                               
Report of Independent Public Accountants......................................................................     2

Financial Statements:

     Statements of Net Assets Available for Plan Benefits
     December 31, 1999 and 1998...............................................................................     3

     Statements of Changes in Net Assets Available for Plan Benefits
     Years ended December 31, 1999 and 1998...................................................................     4

     Notes to Financial Statements............................................................................     5

Supplemental Schedules:

     Schedule H, Line 4i - Schedule of Assets Held for Investment Purposes at End of Year
     December 31, 1999........................................................................................     9

     Schedule H, Line 4j - Schedule of Reportable Transactions
     Year ended December 31, 1999.............................................................................     10

Signatures....................................................................................................     11

Exhibit 23 - Consent of Independent Public Accountants........................................................     12






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                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of Kennametal Inc.
and to the Kennametal Inc. ERISA Compliance Committee:

We have audited the accompanying statements of net assets available for plan
benefits of The Kennametal Thrift Plan (the Plan) as of December 31, 1999 and
1998, and the related statements of changes in net assets available for plan
benefits for the years then ended. These financial statements and the schedules
referred to below are the responsibility of the Plan's management. Our
responsibility is to express an opinion on these financial statements and
schedules based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets available for plan benefits of the Plan as
of December 31, 1999 and 1998, and the changes in net assets available for plan
benefits for the years then ended, in conformity with accounting principles
generally accepted in the United States.

Our audits were made for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedules of assets held
for investment purposes and reportable transactions are presented for the
purpose of additional analysis and are not a required part of the basic
financial statements but are supplementary information required by the
Department of Labor's Rules and Regulations for Reporting and Disclosure under
the Employee Retirement Income Security Act of 1974. The supplemental schedules
and fund information have been subjected to the auditing procedures applied in
the audits of the basic financial statements and, in our opinion, are fairly
stated in all material respects in relation to the basic financial statements
taken as a whole.

/s/ ARTHUR ANDERSEN LLP
- -----------------------
Arthur Andersen LLP

Pittsburgh, Pennsylvania
June 20, 2000







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                           THE KENNAMETAL THRIFT PLAN
              STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS
                           DECEMBER 31, 1999 AND 1998




                                                             December 31,          December 31,
                                                                 1999                  1998
                                                             ------------          ------------
                                                                             
ASSETS
     Receivables:
       Participant contributions                             $    194,146          $    198,305
       Employer contributions                                      75,005                76,217
                                                             ------------          ------------
     Total Receivables                                            269,151               274,522
                                                             ------------          ------------

     General Investments:
       Mutual funds                                           193,490,234           123,156,740
       Common/collective trusts - Fixed income fund            60,532,752            58,786,939
       Kennametal Inc. common stock                            18,146,163            11,877,634
       Participant loans                                        4,814,041             3,913,407
                                                             ------------          ------------
     Total General Investments                                276,983,190           197,734,720
                                                             ------------          ------------

NET ASSETS AVAILABLE FOR PLAN BENEFITS                       $277,252,341          $198,009,242
                                                             ============          ============




The accompanying notes are an integral part of these statements.






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                           THE KENNAMETAL THRIFT PLAN
        STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS
                     YEARS ENDED DECEMBER 31, 1999 AND 1998



                                                                          December 31, 1999
                                                         ---------------------------------------------------
                                                         Kennametal Inc.         All
                                                             Common              Other                             December 31,
                                                           Stock Fund            Funds             Total               1998
                                                         ---------------     ------------       ------------       ------------
                                                                                                       
ADDITIONS TO NET ASSETS ATTRIBUTED TO:
     Participant contributions                             $ 1,140,127       $ 13,189,300       $ 14,329,427       $ 16,114,687
     Employer contributions                                  1,531,949          3,541,919          5,073,868          5,261,948
     Earnings on investments                                   424,289         19,384,998         19,809,287         11,075,033
     Net realized gains on disposition and unrealized
        appreciation in fair value of investments            7,325,468         44,389,784         51,715,252         10,873,330
     Transfers from other plans                                     17          6,136,690          6,136,707                 --
     Other                                                       2,247            153,443            155,690             82,098
                                                           -----------       ------------       ------------       ------------
        Total Additions                                     10,424,097         86,796,134         97,220,231         43,407,096
                                                           -----------       ------------       ------------       ------------

DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO:
     Benefit payments                                         (733,113)       (13,749,762)       (14,482,875)       (10,478,105)
     Loan distribution                                              --           (206,291)          (206,291)           (93,666)
     Employee withdrawals                                     (153,270)        (2,798,501)        (2,951,771)        (2,701,946)
     Administrative fees                                          (717)           (97,366)           (98,083)          (123,760)
     Forfeitures                                                (8,294)          (128,064)          (136,358)           (71,611)
     Other                                                          --           (101,754)          (101,754)           (82,332)
                                                           -----------       ------------       ------------       ------------
        Total Deductions                                      (895,394)       (17,081,738)       (17,977,132)       (13,551,420)
                                                           -----------       ------------       ------------       ------------

NET TRANSFERS BETWEEN FUNDS                                 (3,260,174)         3,260,174                 --                 --

NET INCREASE                                                 6,268,529         72,974,570         79,243,099         29,855,676

NET ASSETS AVAILABLE FOR PLAN BENEFITS:
   Beginning of year                                        11,877,634        186,131,608        198,009,242        168,153,566
                                                           -----------       ------------       ------------       ------------
   End of year                                             $18,146,163       $259,106,178       $277,252,341       $198,009,242
                                                           ===========       ============       ============       ============




The accompanying notes are an integral part of these statements.



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                           THE KENNAMETAL THRIFT PLAN
                          NOTES TO FINANCIAL STATEMENTS
                           DECEMBER 31, 1999 AND 1998

1. DESCRIPTION OF PLAN

The following general description of the Kennametal Thrift Plan, as amended (the
Plan), is provided for general information purposes only. Participants should
refer to the Plan document for complete information.

The Plan is a defined contribution employee benefit plan, established to
encourage investment and savings for certain salaried and hourly employees of
Kennametal Inc. and certain subsidiaries and to provide a method to supplement
their retirement income benefits. The Plan provides these employees the
opportunity to defer a portion of their annual base compensation for federal
income tax purposes in accordance with Section 401(k) of the Internal Revenue
Code, as amended (the Code). The Plan is subject to certain provisions of the
Employee Retirement Income Security Act of 1974, as amended (ERISA). Kennametal
Inc. is the Plan sponsor.

During Kennametal Inc.'s fiscal years ended June 30, 1997 and 1998, Kennametal
Inc., through a majority-owned subsidiary, acquired five companies, each
sponsoring a defined contribution employee benefit plan. During 1999, the assets
of these plans were merged into the Plan.

In September 1999, all Putnam mutual fund balances were transferred from Class A
shares to Class Y shares to take advantage of lower management fees associated
with the Class Y shares. This transfer did not change the participant investment
choices or the value of participant accounts.

ADMINISTRATION OF THE PLAN - Putnam Fiduciary Trust Company serves as the
Trustee of the Plan. Putnam Investments functions as the recordkeeper for the
Plan.

ELIGIBILITY - All eligible employees are entitled to become active participants
of the Plan on the first day of the month coinciding with or following the
completion of ten (10) days of service. Under present federal income tax law,
employer contributions and all earnings of the Plan do not constitute taxable
income to the participants until withdrawn from the Plan by the participants.

VESTING - Employee contributions are fully vested. Employer matching
contributions are fully vested after the third anniversary of the participant's
employment date. Forfeitures of employer contributions as a result of
withdrawals, terminations, etc., reduce the amount of future contributions
required by the employer.

PARTICIPANT ACCOUNTS - A separate account is maintained for each participant in
the Plan, reflecting contributions, investments, investment gains and losses,
distributions, loans, withdrawals and transfers.

CONTRIBUTIONS - The Plan allows participants to elect a contribution rate
(either before-tax, after-tax, or a combination of both) of 2% to 12% of the
employee's base salary. The participants can elect to have their contributions
invested in the different investment funds available under the Plan. Employer
contributions equal 50% of the participant contribution up to a maximum of 3% of
the participant's salary. Employer contributions are made concurrently with
participant contributions. Effective October 1, 1999, employer contributions are
made solely in Kennametal Inc. common stock.




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DISTRIBUTIONS - Distributions to participants due to disability, retirement,
hardship or death are payable in either a lump sum, periodic payments for a
period not to exceed ten (10) years, or through the purchase of an annuity at
the participant's election.

PARTICIPANT LOANS - A participant may borrow up to the lesser of $50,000 or 50%
of his or her vested account balance, with a minimum loan amount of $1,000.
Loans are repayable through payroll deductions over a period not to exceed five
years. If the proceeds are used to acquire a participant's principal residence,
the repayment period shall be no more than 15 years. The interest rate is
determined by the plan administrator based on existing market conditions and is
fixed over the life of the loan. The interest rate at December 31, 1999 was
9.25%.

INVESTMENTS - A participant may direct contributions to any of the following
investment options:

PRIMCO Stable Value Fund - Investments of this fixed income fund consist of
traditional investment contracts issued by insurance companies, banks and other
financial institutions (or corporations), asset-backed investment contracts,
synthetic investment contracts and short-term investments.

Putnam Voyager Fund - This fund seeks aggressive capital appreciation by
investing in a combination of stocks of small companies expected to grow over
time as well as in stocks of larger, more established corporations.

Putnam Asset Allocation: Balanced Portfolio - For investors who want an
investment with moderate risk and the potential for moderate growth, this fund
seeks a balance between the relative stability of bonds and the fluctuation of
stocks, in efforts to reduce overall risk.

The Putnam Fund for Growth & Income - This fund seeks growth and income by
investing in attractively priced stocks of companies that offer long-term growth
potential while also providing income.

Putnam New Opportunities Fund - This fund seeks long-term capital appreciation
by investing primarily in common stocks of companies within certain emerging
industry groups that Putnam Management believes offer above-average potential
for growth.

Putnam Asset Allocation: Growth Portfolio - For more aggressive investors who
will accept more risk in exchange for a higher growth potential, this fund seeks
diversification among different types of stocks, with some investments in bonds
and money market funds.

Putnam Asset Allocation: Conservative Portfolio - For investors who are willing
to assume a reduced potential for growth in exchange for less risk, this fund
seeks to reduce overall risk through substantial investments in investment-grade
bonds, with some investments in stocks to help stay ahead of inflation.

Putnam International Growth Fund - This fund seeks capital appreciation by
investing in a diversified portfolio of companies located outside the United
States.





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Kennametal Inc. Common Stock Fund - This fund consists entirely of Kennametal
Inc. common stock, for investors who want to participate in the growth of
Kennametal Inc. as part owners of Kennametal Inc.

MAS Small Cap Value Fund - This fund seeks above average total return over a
three- to five-year period by investing primarily in common stocks and other
equity securities similar to companies included in the Russell 2000 Index. The
fund focuses on stocks that are undervalued based on the advisor's own measures
of value.

Vanguard 500 Index Fund - This fund seeks to provide long-term growth of capital
and income from dividends by holding all the 500 stocks that make up the
Standard & Poor's 500 Composite Stock Price Index in proportion to their
weightings in the index.

2. ACCOUNTING POLICIES

BASIS OF ACCOUNTING - The financial statements of the Plan are maintained on the
accrual basis of accounting.

INVESTMENTS - Investment transactions are recorded on a trade date basis and
revenues are recorded on an accrual basis of accounting. Investments in mutual
funds, Kennametal Inc. common stock and other short-term investments are stated
at fair value as measured by readily available market prices. Participant loans
are valued at cost, which approximates fair value. Benefit-responsive investment
contracts are valued at contract value. According to the provisions of AICPA
Statement of Position (SOP) 94-4, "Reporting of Investment Contracts Held by
Health and Welfare Benefit Plans and Defined-Contribution Pension Plans,"
guaranteed investment contracts of defined contribution plans are considered to
be fully benefit-responsive. As a result, these contracts are accounted for at
contract value in the accompanying financial statements. PRIMCO Capital
Management, Inc. certified that all the investment contracts held in the Fixed
Income Fund are fully benefit-responsive. The difference between the contract
value and the fair value of all investment contracts was $1,082,260 and
$1,342,443 at December 31, 1999 and 1998, respectively. The crediting interest
rates on the contracts ranged from 4.96% to 7.55% at December 31, 1999 and from
4.38% to 7.55% at December 31, 1998.

INVESTMENT INCOME - Interest and dividend income are recorded in the period
earned. Gains and losses on securities sold or redeemed are determined on the
basis of specific identification.

PLAN EXPENSES - Investment management, recordkeeping and other administrative
fees and expenses of the Plan are paid from assets and income of the Plan.

REALIZED/UNREALIZED GAINS AND LOSSES - Realized gains and losses on investments
sold or redeemed and unrealized gains and losses are determined using the
average cost method.

USE OF ESTIMATES IN PREPARATION OF FINANCIAL STATEMENTS - The preparation of
financial statements in conformity with generally accepted accounting principles
requires the plan administrator and sponsor to make estimates and assumptions
that affect the amounts reported in the financial statements and accompanying
notes. Actual results may differ from these estimates.





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NEW ACCOUNTING STANDARD - The Accounting Standards Executive Committee issued
SOP 99-3, "Accounting for and Reporting of Certain Defined Contribution Plan
Investments and Other Disclosure Matters," which eliminates the requirement for
a defined contribution plan to disclose participant-directed investment
programs. The Plan adopted SOP 99-3 for the 1999 financial statements and
reclassified certain amounts in the 1998 financial statements to eliminate the
participant-directed fund investment program disclosures.


3. INVESTMENTS EXCEEDING FIVE PERCENT OF NET ASSETS

The fair market values of individual investments that represent five percent or
more of the Plan's total plan assets as of December 31, 1999 and 1998, were as
follows:



                                                      December 31,          December 31,
                                                          1999                  1998
                                                      ------------          -----------
                                                                      
Common/Collective Trusts - Fixed Income Fund          $ 60,532,752          $58,786,939
Putnam Mutual Funds -
     Voyager                                           100,753,156           67,433,093
     New Opportunities                                  37,805,122           17,950,148
     Asset Allocation - Balanced Portfolio              15,401,938           12,841,774
     Growth & Income                                    14,881,798           12,266,895
Kennametal Inc. Common Stock                            18,146,163           11,877,634


4. QUALIFICATION OF PLAN

The Plan has been determined by the Internal Revenue Service to be a qualified
employee benefit plan under the Code. The Internal Revenue Service issued a
favorable determination on April 23, 1996. Plans that are qualified under
regulations of the Internal Revenue Service are not subject to federal income
taxes.

5. PLAN TERMINATION

Although it has not expressed any intent to do so, Kennametal Inc. has the right
to amend, suspend or terminate the Plan at any time, subject to the provisions
of ERISA. In the event of Plan termination, the accounts of all participants
will become fully vested and non-forfeitable.





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                           THE KENNAMETAL THRIFT PLAN
                                PLAN NUMBER: 002
                                KENNAMETAL INC.
                                EIN: 25-0900168
         SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AT END OF YEAR
                              SCHEDULE H, LINE 4i
                               DECEMBER 31, 1999




   Identity                                                                                           Current
   of Issue                 Description of Investment                                                  Value
- ----------------------------------------------------------------------------------------------------------------
                                                                                              
                 Mutual Funds
                 ------------

    *Putnam      Putnam Voyager Fund                                                                $100,753,156
    *Putnam      Putnam New Opportunities Fund                                                        37,805,122
    *Putnam      Putnam Asset Allocation - Balanced Portfolio                                         15,401,938
    *Putnam      The Putnam Fund for Growth & Income                                                  14,881,798
    *Putnam      Putnam International Growth Fund                                                     12,933,535
    *Putnam      Putnam Asset Allocation - Growth Portfolio                                            5,994,250
    *Putnam      Putnam Asset Allocation - Conservative Portfolio                                      4,410,723
    *Putnam      Vanguard 500 Index Fund                                                               1,067,886
    *Putnam      MAS Small Cap Value Fund                                                                241,826
                                                                                                    ------------

                 Total Mutual Funds                                                                  193,490,234
                                                                                                    ------------

                 Collective/Common Trusts
                 ------------------------

    *Putnam      PRIMCO Stable Value Fund                                                             59,450,492
                                                                                                     -----------

                 Kennametal Inc. Common Stock
                 ----------------------------

    *Putnam      Kennametal Inc. Common Stock (a)                                                     18,146,163
                                                                                                    ------------

                 Loans to Participants
                 ---------------------

 *Participants   Loans to Participants, Maturities: From January 2000 to December
                   2014, Interest rates: 8.75% to 9.25%                                                4,814,041
                                                                                                    ------------

                 Total Investments                                                                  $275,900,930
                                                                                                    ============


*    Party-in-interest.
(a)  The cost of this investment is $14,309,974 at December 31, 1999.





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                           THE KENNAMETAL THRIFT PLAN
                                PLAN NUMBER: 002
                                KENNAMETAL INC.
                                EIN: 25-0900168
                    SCHEDULE OF REPORTABLE TRANSACTIONS (a)
                              SCHEDULE H, LINE 4j
                          YEAR ENDED DECEMBER 31, 1999




Identity of                                                                                            Current Value
   Party                                                     Purchase       Selling         Cost        of Asset on          Net
 Involved             Description of Investment                Price         Price        of Asset    Transaction Date   Gain/(Loss)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
  *Putnam    Putnam Voyager Fund                            $71,240,091   $71,240,091   $54,026,735     $71,240,091     $17,213,356

  *Putnam    Putnam New Opportunities Fund                   23,558,728    23,558,728    19,144,016      23,558,728       4,414,712

  *Putnam    The Putnam Fund for Growth & Income             13,832,867    13,832,867    14,574,841      13,832,867        (741,974)

  *Putnam    Putnam Asset Allocation - Balanced Portfolio    13,111,047    13,111,047    12,120,683      13,111,047         990,364


*    Party-in-interest.

(a)  Represent non-participant transactions or a series of non-participant
     transactions in excess of 5% of the fair value of the Plan assets at the
     beginning of the year.







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                                   SIGNATURES

THE PLAN. Pursuant to the requirements of the Securities Exchange Act of 1934,
the plan administrator of the Kennametal Thrift Plan has duly caused this annual
report to be signed on its behalf by the undersigned, hereunto duly authorized,
in Unity Township, Westmoreland County, Commonwealth of Pennsylvania.

                                                  KENNAMETAL THRIFT PLAN


Date: June 26, 2000                               By: /s/ AMY DOVERSPIKE
                                                      --------------------------
                                                      Amy Doverspike
                                                      Plan Administrator






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