UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 11-K

(Mark One)

þ		ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

o		TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

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:

KENNAMETAL RETIREMENT INCOME SAVINGS 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

 

 

KENNAMETAL RETIREMENT INCOME SAVINGS PLAN
INDEX TO FINANCIAL STATEMENTS

		Page
Report of Independent Registered Public Accounting Firm			2
Financial Statements:
Statements of Net Assets Available for Benefits December 31, 2010 and 2009			3
Statement of Changes in Net Assets Available for Benefits For the Year Ended December 31, 2010			4
Notes to Financial Statements			5
Supplemental Schedule:
Schedule H, Line 4i — Schedule of Assets (Held at End of Year) December 31, 2010			14
Signatures			15
Exhibit 23 — Consent of Independent Registered Public Accounting Firm
EX-23

Note: Other schedules required by Section 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under ERISA have been omitted because they are not applicable.

Report of Independent Registered Public Accounting Firm

To the Participants and Administrator of
the Kennametal Retirement Income Savings Plan:

We have audited the accompanying statements of net assets available for benefits of the Kennametal Retirement Income Savings Plan (the Plan) as of December 31, 2010 and 2009, and the related statement of changes in net assets available for benefits for the year ended December 31, 2010. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. 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 benefits of the Plan as of December 31, 2010 and 2009, and the changes in its net assets available for benefits for the year ended December 31, 2010, in conformity with accounting principles generally accepted in the United States of America.

Our audits were performed for the purpose of forming an opinion on the financial statements taken as a whole. The accompanying supplemental schedule of assets (held at end of year) as of December 31, 2010 is presented for purposes of additional analysis and is not a required part of the financial statements, but is 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. Such information is the responsibility of management and was derived from and relates directly to the underlying accounting and other records used to prepare the financial statements. The information has been subjected to the auditing procedures applied in the audit of the financial statements and certain additional procedures, including comparing and reconciling such information directly to the underlying accounting and other records used to prepare the financial statements or to the financial statements themselves, and other additional procedures in accordance with auditing standards generally accepted in the United States of America. In our opinion, the information is fairly stated in all material respects in relation to the financial statements as a whole.

Pittsburgh, Pennsylvania
June 24, 2011

KENNAMETAL RETIREMENT INCOME SAVINGS PLAN
STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2010 AND 2009

		2010				2009
ASSETS
Receivables:
Notes receivable from participants (Note 2)		$	239,217			$	279,919
Employer contributions			32,519				30,527
Participant contributions			11,456				7,190
Total receivables			283,192				317,636
Investments at fair value (Note 3):
Mutual funds			6,996,906				6,305,017
Master trust			4,814,311				4,972,489
Kennametal Inc. common stock			2,776,343				1,825,158
Total investments at fair value			14,587,560				13,102,664
Total assets			14,870,752				13,420,300
Adjustment from fair value to contract value for fully benefit-responsive investment contracts			(219,654	)			(147,287	)
NET ASSETS AVAILABLE FOR BENEFITS		$	14,651,098			$	13,273,013

The accompanying notes are an integral part of these financial statements.

KENNAMETAL RETIREMENT INCOME SAVINGS PLAN
STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
FOR THE YEAR ENDED DECEMBER 31, 2010

		2010
ADDITIONS TO NET ASSETS ATTRIBUTED TO:
Net appreciation in fair value of investments		$	1,898,285
Dividends and interest			332,658
Participant contributions			138,770
Employer contributions			58,926
Employer contributions — Kennametal common stock			57,886
Interest — notes receivable from participants (Note 2)			14,314
Total additions			2,500,839
DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO:
Benefits paid to participants			1,112,168
Loan distributions			10,200
Administrative fees			386
Total deductions			1,122,754
NET INCREASE			1,378,085
NET ASSETS AVAILABLE FOR BENEFITS:
Beginning of year			13,273,013
End of year		$	14,651,098

The accompanying notes are an integral part of these financial statements.

KENNAMETAL RETIREMENT INCOME SAVINGS PLAN

NOTE 1 — DESCRIPTION OF PLAN

The following general description of the Kennametal Retirement Income Savings 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 plan, established to encourage investment and savings for eligible union employees of Kennametal Inc. (Kennametal or the Company), and to provide a method to supplement their retirement income. The Plan provides these employees the opportunity to defer a portion of their annual compensation for federal income tax purposes in accordance with Section 401(k) of the Internal Revenue Code, as amended (IRC). The Plan also provides for Company contributions. 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.

ADMINISTRATION OF THE PLAN — The management of the Company has the authority and responsibility for the general administration of the Plan. Fidelity Management Trust Company functions as the trustee, and Fidelity Investments Institutional Operations Company functions as the recordkeeper.

ELIGIBILITY — Employees are participants in the Plan on the first day of the first payroll period subsequent to completing six (6) months 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 — All participant and employer contributions vest immediately.

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

CONTRIBUTIONS — The Company is required to contribute quarterly, a base amount of 2% of each eligible employee’s wages, which include base salary, overtime, shift differential pay and incentive compensation. Participants may elect to contribute to the Plan from 1% to 20% of their pre-tax wages through payroll deductions. Employees who are age 50 or older and who exceed the annual dollar limit under the law or the Plan are eligible to make catch-up contributions. Unless otherwise amended, the Plan provides for employer matching contribution of 50% of employee contributions up to 4%. As such, the maximum employer matching contribution is 2%. Under the Plan, the Company has the discretion to make its employer matching contributions in Kennametal common stock.

The participants can elect to have their contributions (pre-tax, catch-up and rollover amounts) invested in the different investment funds available under the Plan. Currently, the Plan offers 22 mutual funds, Kennametal Common Stock, and a Master Trust. Employer mandatory and matching contributions are made quarterly. During January and February 2009, prior year employer contribution receivable was invested in the same investment fund elections that the employee elected for their pre-tax or after-tax contributions. For the period March 1, 2009 through July 31, 2010, employer contributions were made in Kennametal common stock. For the period August 1 through December 31, 2010, employer contributions were made in cash.

DISTRIBUTIONS — Distributions to participants due to disability, retirement or death are payable in either a lump sum or in periodic payments for a period not to exceed ten (10) years. If a participant’s vested interest in his or her account exceeds $1,000, a participant may elect to defer distribution to a future date as more fully described in the plan document.

In addition, while still employed, participants may withdraw pre-tax employee and Company contributions if over age 59.5, at any time. Pre-tax employee and Company contributions can be withdrawn by participants under age 59.5 only for specific hardship reasons.

NOTES RECEIVABLE FROM PARTICIPANTS — Participants may borrow from their accounts a minimum of $1,000 up to a maximum equal to the lesser of $50,000 less the excess of the highest outstanding note balance during the previous one-year period over the outstanding balance as of the date of the note or 50% of their account balance as defined by the Plan or the IRC. Principal and interest are paid ratably through payroll deductions. The maximum term permissible for a general-purpose note is 5 years and 30 years for a residential note. The interest rate is determined by the plan administrator based on existing market conditions and is fixed over the life of the note. Interest rates on notes receivable from participants ranged from 4.25% to 9.50% at December 31, 2010 and 4.25% to 9.25% at December 31, 2009. Notes receivable from participants outstanding at December 31, 2010 have maturity dates ranging from 2011 to 2039.

INVESTMENTS — Participants direct their contributions and Company cash contributions by electing that such contributions be placed in a single investment fund or allocated to any combination of investment funds available under the Plan. Earnings derived from the assets of any investment fund are reinvested in the fund to which they relate. Participants may elect at any time to transfer all or a portion of the value of their accounts among the investment funds.

For Company contributions made in Kennametal common stock, participants have the ability to exchange the Kennametal common stock for a single investment fund or for any combination of investment funds under the Plan.

NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF ACCOUNTING — The financial statements of the Plan are prepared under the accrual method of accounting.

As described in the guidance on “Reporting of Fully Benefit-Responsive Investment Contracts Held by Certain Investment Companies subject to the AICPA Investment Company Guide and Defined-Contribution Health and Welfare and Pension Plans,” investment contracts held by a defined-contribution plan are required to be reported at fair value. However, contract value is the relevant measurement attribute for that portion of the net assets available for benefits of a defined-contribution plan attributable to fully benefit-responsive investment contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan. As required by this standard, the statements of net assets available for benefits present the fair value of the investment contract as well as the adjustment of the fully benefit-responsive investment contract from fair value to contract value. The statements of net assets available for benefits are prepared on a contract value basis.

RECENT ACCOUNTING PRONOUNCEMENTS

As of December 31, 2010, the Plan adopted new guidance which clarifies the classification and measurement of participant loans by defined contribution pension plans. That guidance requires that participant loans be classified as notes receivable from participants and measured at their unpaid principal balance, plus any accrued but unpaid interest. The Plan adopted this new guidance in its December 31, 2010 financial statements and has reclassified participant loans of $279,919 for the year ended December 31, 2009 from investments to notes receivable from participants. Net assets of the Plan were not affected by the adoption of the new guidance.

As of December 31, 2010, the Plan adopted new guidance on fair value measurements and disclosures. This guidance requires new disclosures for fair value measurements and provides clarification for existing disclosures requirements. More specifically, this guidance requires (1) an entity to disclose separately the amounts of significant transfers in and out of Levels 1 and 2 fair value measurements and to describe the reasons for the transfers, and (2) information about purchases, sales, issuances and settlements to be presented separately (i.e. present the activity on a gross basis rather than net) in the reconciliation for fair value measurements using significant unobservable inputs (Level 3 inputs). This guidance clarifies existing disclosure requirements for the level of disaggregation used for classes of assets and liabilities measured at fair value and requires disclosures about the valuation techniques and inputs used to measure fair value for both recurring and nonrecurring fair value measurements using Level 2 and Level 3 inputs. The new disclosures about purchases, sales, issuances, and settlements in the roll forward of activity in Level 3 fair value measurements are effective for the Plan beginning January 1, 2011. See Note 3 for required disclosures.

USE OF ESTIMATES — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results may differ from those estimates.

INVESTMENTS — Investment transactions are recorded on a trade date basis. INVESCO Institutional, Inc. reported that all the investment contracts held in the Master Trust under the Stable Value Fund (see Note 5) are fully benefit-responsive. Fully benefit-responsive investment contracts are reported at fair value under investments with a corresponding adjustment to contract value for purposes of reporting net assets available for investments. Shares of mutual funds are valued at the net asset value of shares held by the Plan at year-end. Investments in Kennametal common stock are valued at their quoted market price at year-end.

NOTES RECEIVABLE FROM PARTICIPANTS — Notes receivable from participants are measured at their unpaid principal balance plus any accrued but unpaid interest. Interest income is recorded in the period earned.

PAYMENT OF BENEFITS — Benefit payments are recorded when paid to participants / beneficiaries.

INVESTMENT INCOME — Interest and dividend income are recorded in the period earned.

NET APPRECIATION — Net appreciation in fair value of investments is composed of unrealized gains and losses, which represent the change in market value compared to the cost of investments in each year, and realized gains and losses on security transactions, which represent the difference between proceeds received and average cost. Net appreciation in fair value of investments for the year ended December 31, 2010 was as follows:

		2010
Kennametal Inc. Common Stock		$	968,116
Mutual Funds			930,169
Total		$	1,898,285

PLAN EXPENSES — Expenses attributable to the administration or operation of the Plan and related trust are allocated pro rata on the basis of account balances to the accounts of participants unless the Board of Directors of the Company, at its sole discretion, determines that such expenses are to be paid by the Company. For the year ended December 31, 2010, the Company paid substantially all administrative expenses related to the operation of the Plan. Investment management fees and costs incurred in connection with the purchase and sale of securities are equitably apportioned among the respective investment funds. These expenses are included as a deduction from net assets in the statement of changes in net assets available for benefits.

NOTE 3 — FAIR VALUE MEASUREMENTS

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy consists of three levels to prioritize the inputs used in valuations, as defined below:

Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2: Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level 3: Inputs that are unobservable.

The following sections describe the valuation methodologies used by the Plan to measure investments at fair value, including an indication of the level in the fair value hierarchy in which each major category of investments is generally classified. Where appropriate, the description includes details of the valuation models and any significant assumptions.

Mutual Funds Investments in mutual funds are valued at quoted net asset values at year end.

Master Trust The plan has an undivided interest in the underlying assets of the Master Trust. Assets of the Master Trust are held in a stable value fund by INVESCO. The Master Trust primarily invests in wrapper contracts, or synthetic guaranteed investment contracts. See Note 5 for additional disclosures related to the Master Trust. The fair value of the underlying assets of the Master Trust were determined using a present value model and the principal inputs are discount rate, fee periods, fee invoice schedule, contract value, replacement cost and actual cost.

Common Stock Investments in common stock are valued at their quoted market price at year-end.

As of December 31, 2010, the fair values of the Plan’s investments measured on a recurring basis are categorized as follows:

		Level 1				Level 2				Level 3				Total
Mutual funds:
Balanced funds		$	2,645,610				—				—			$	2,645,610
Growth funds			1,644,340				—				—				1,644,340
Value funds			1,257,080				—				—				1,257,080
Index funds			1,153,428				—				—				1,153,428
Fixed income funds			296,448				—				—				296,448
Plan’s interest in Kennametal Inc. Master Trust:
Synthetic guaranteed investment contracts			—			$	4,588,389				—				4,588,389
Money market fund			—				225,922				—				225,922
Kennametal Inc. common stock			2,776,343				—				—				2,776,343
Total investments		$	9,773,249			$	4,814,311				—			$	14,587,560

As of December 31, 2009, the fair values of the Plan’s investments measured on a recurring basis are categorized as follows:

		Level 1				Level 2				Level 3				Total
Mutual funds:
Balanced funds		$	2,449,078				—				—			$	2,449,078
Growth funds			1,411,371				—				—				1,411,371
Value funds			1,121,419				—				—				1,121,419
Index funds			1,068,599				—				—				1,068,599
Fixed income funds			254,550				—				—				254,550
Plan’s interest in Kennametal Inc. Master Trust:
Synthetic guaranteed investment contracts			—			$	4,856,900				—				4,856,900
Money market fund			—				115,589				—				115,589
Kennametal Inc. common stock			1,825,158				—				—				1,825,158
-
Total investments		$	8,130,175			$	4,972,489				—			$	13,102,664

NOTE 4 — INVESTMENTS EXCEEDING FIVE PERCENT OF NET ASSETS

The fair values of individual investments that represent five percent or more of the Plan’s total net assets as of December 31 were as follows:

		2010				2009
| |
Stable Value Fund		$	4,814,311			$	4,972,489
Kennametal Inc. Common Stock			2,776,343				1,825,158
Fidelity Freedom 2015 Fund			1,889,673				1,732,254
MSIFT MidCap Growth Portfolio			1,199,795				948,035
Vanguard Institutional Index Fund			1,146,555				1,068,519
H&W LargeCap Value Fund			927,983				779,757

NOTE 5 — MASTER TRUST

A portion of the Plan’s investments are held in a Master Trust, which was established for the investment of assets of the Plan and two other Company-sponsored defined contribution plans. Each plan has an undivided interest in the underlying assets of the Master Trust. The assets of the Master Trust are held in a stable value fund by INVESCO. Investment income relating to the Master Trust is allocated to the individual plans based upon average monthly balances invested by each plan. The underlying assets of the Master Trust include benefit-responsive investment contracts (the contracts).

The Master Trust’s key objectives are to provide preservation of principal, maintain a stable interest rate, and provide daily liquidity at contract value for participant withdrawals and transfers in accordance with the provisions of the Plan.

To accomplish the objectives described above, the Master Trust primarily invests in wrapper contracts, or synthetic guaranteed investment contracts (GICs). In wrapper contracts, the investments are owned and held by the Master Trust for Plan participants. The Trust purchases a wrapper contract from an insurance company or bank. The wrapper contract amortizes the realized and unrealized gains and losses on the underlying fixed-income investments, typically over the duration of the investments, through adjustments to the future interest-crediting rate, the rate earned by participants in the Master Trust for the underlying investments. The issuer of the wrapper contract provides assurance that the adjustment to the interest-crediting rate will not result in a future interest-crediting rate that is less than zero. An interest-crediting rate less than zero would result in a loss of principal or accrued interest.

The key factors that influence future interest-crediting rates for a wrapper contract include the level of market interest rates, the amount and timing of participant activity within the wrapper contract, the investment returns and the duration of the underlying investments. Most wrapper contracts use a formula based on the characteristics of the underlying fixed-income portfolio to determine a crediting rate. Over time, the crediting rate formula amortizes the Master Trust’s realized and unrealized market value gains and losses over the duration of the investments. The wrapper contracts’ interest-crediting rates are typically reset on a monthly or quarterly basis.

The average yield earned by the Plan based on actual earnings was 2.20% and 3.10% for the years ended December 31, 2010 and 2009, respectively. The average yield earned by the Plan based on the interest rate credited to participants was 3.84% and 4.07% for the years ended December 31, 2010 and 2009, respectively.

In certain circumstances, the amount withdrawn from the wrapper contract would be payable at fair value rather than at contract value. These events include termination of the Plan, a material adverse change to the provisions of the Plan, if the employer elects to withdraw from a contract in order to switch to a different investment provider, or if the terms of a successor plan do not meet the wrapper contract issuer’s underwriting criteria for issuance of a clone wrapper contract. Management believes that the events described above could result in the payment of benefits at fair value rather than contract value and are not probable of occurring in the foreseeable future.

Investments held by the Master Trust at December 31, 2010 were as follows:

										Adjustments				Investments
		Issuer				Investments				to Contract				at Contract
Security		Rating				at Fair Value				Value				Value
Wrapped Portfolios
Common Collective Trusts:
NATIXIS IGT INVESCO Short-term Bond Fund		A+/Aa3				$	21,001,687			$	(846,444	)		$	20,155,243
ING IGT INVESCO Multi-Mgr A or Better Interm. G/C Fund			A/A2				21,111,206				(1,236,191	)			19,875,015
Pacific Life IGT INVESCO Multi-Mgr A or Better Interm. G/C Fund			A+/A1				21,155,488				(1,290,450	)			19,865,038
Monumental IGT INVESCO Multi-Mgr A or Better Core Fund		AA-/A1					18,519,297				(757,955	)			17,761,342
JP Morgan Chase IGT INVESCO Short-term Bond Fund		AA-/Aa1					15,457,065				(618,435	)			14,838,630
State Street IGT INVESCO Short-term Bond Fund		AA-/Aa2					14,848,896				(616,130	)			14,232,766
Pacific Life Wrapper contracts			A+/A1				58,152				(3,547	)			54,605
Monumental Wrapper contracts		AA-/A1					38,168				(1,562	)			36,606
Short-Term Investments
Fidelity Money Market			N/A				5,523,988				—				5,523,988
Total						$	117,713,947			$	(5,370,714	)		$	112,343,233

At December 31, 2010, the Plan’s interest in the Master Trust was approximately 4 percent. Total investment income for the Master Trust was $4,297,357 for the year ended December 31, 2010. The investment income for the Master Trust is recorded in dividends and interest in the statement of changes in net assets available for benefits.

Investments held by the Master Trust at December 31, 2009 were as follows:

										Adjustments				Investments
		Issuer				Investments				to Contract				at Contract
Security		Rating				at Fair Value				Value				Value
Wrapped Portfolios
Common Collective Trusts:
NATIXIS IGT INVESCO Short-term Bond Fund		A+/Aa3				$	21,911,322			$	(528,132	)		$	21,383,190
Pacific Life IGT INVESCO Multi-Mgr A or Better Interm. G/C Fund		AA-/A1					20,455,173				(871,925	)			19,583,248
ING IGT INVESCO Multi-Mgr A or Better Interm. G/C Fund			A+/A2				20,413,406				(854,223	)			19,559,183
Monumental IGT INVESCO Multi-Mgr A or Better Core Fund		AA-/A1					17,799,101				(372,217	)			17,426,884
JP Morgan Chase IGT INVESCO Short-term Bond Fund		AA-/Aa1					16,214,023				(404,935	)			15,809,088
State Street IGT INVESCO Short-term Bond Fund		AA-/Aa2					15,628,716				(376,358	)			15,252,358
JP Morgan Chase Wrapper contracts		AA-/Aa1					29,797				(744	)			29,053
Pacific Life Wrapper contracts		AA-/A1					20,625				(879	)			19,746
Short-Term Investments
Fidelity Money Market			N/A				2,675,666				—				2,675,666
Total						$	115,147,829			$	(3,409,413	)		$	111,738,416

At December 31, 2009, the Plan’s interest in the Master Trust was approximately 4 percent.

NOTE 6 — TAX STATUS

The Plan obtained its latest determination letter on March 10, 2003, in which the Internal Revenue Service stated that the Plan, as then designed, was in compliance with the applicable requirements of the IRC. The Plan has been amended since receiving the determination letter. However, the Plan administrator and the Plan’s tax counsel believe that the Plan is currently designed and being operated in compliance with the applicable requirements of the IRC. Therefore, no provision for income taxes has been included in the Plan’s financial statements. The Plan is subject to routine audits by taxing jurisdictions; however there are currently no audits for any tax periods in progress. The plan administrator believes it is no longer subject to income tax examinations for years prior to 2007.

NOTE 7 — PLAN TERMINATION

Although it has not expressed any intent to do so, the Company has the right to suspend or terminate the Plan at any time, subject to the provisions of the ERISA and according to the terms of the collective bargaining agreement.

NOTE 8 — RISKS AND UNCERTAINTIES

The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the statements of net assets available for benefits.

NOTE 9 — RELATED PARTY TRANSACTIONS

Certain investments of the Plan are mutual funds managed by Fidelity Investments. The trustee of the Plan is Fidelity Management Trust Company and, therefore, these transactions qualify as party-in-interest transactions.

One of the investment fund options available to participants is common stock of Kennametal Inc., the Plan sponsor. The Plan held 70,223 and 70,375 shares of Kennametal common stock, or $2,776,343 and $1,825,158 at December 31, 2010 and 2009, respectively. As a result, transactions related to this investment fund qualify as party-in-interest transactions.

KENNAMETAL RETIREMENT INCOME SAVINGS PLAN
PLAN NUMBER: 015
EIN: 25-0900168

(a)

(b) Issuer

(c) Description

(d) Cost

(e) Fair Value

Mutual Funds

*

Fidelity

Fidelity Freedom 2015 Fund

N/A

$

1,889,673

Morgan Stanley

MSIFT MidCap Growth Portfolio

N/A

1,199,795

Vanguard

Vanguard Institutional Index Fund

N/A

1,146,555

Hotchkis & Wiley

H&W LargeCap Value Fund

N/A

927,983

*

Fidelity

Fidelity Freedom 2020 Fund

N/A

300,308

American Funds

American Funds EuroPacific Growth Fund

N/A

244,519

Lord Abbett

Lord Abbett SmallCap Value Fund

N/A

229,424

Vanguard

Vanguard Total Bond Market Index Signal

N/A

215,837

*

Fidelity

Fidelity Freedom 2030 Fund

N/A

188,090

*

Fidelity

Fidelity Capital Appreciation Fund

N/A

112,358

*

Fidelity

Fidelity Freedom 2025 Fund

N/A

102,945

Hotchkis & Wiley

H&W MidCap Value Fund

N/A

99,355

*

Fidelity

Fidelity Freedom Income Fund

N/A

81,796

Pimco

Pimco Total Return Fund

N/A

80,611

Morgan Stanley

MSIF Small Company Growth Portfolio

N/A

77,862

*

Fidelity

Fidelity Freedom 2040 Fund

N/A

63,554

*

Fidelity

Fidelity Freedom 2010 Fund

N/A

17,484

Vanguard

Vanguard MidCap Index Signal

N/A

6,873

Vanguard

Vanguard Total International Stock

N/A

6,708

Lord Abbett

Lord Abbett SmallCap Blend Fund

N/A

3,098

*

Fidelity

Fidelity Freedom 2035 Fund

N/A

1,760

Allianz

Allianz NFJ Dividend Value Fund

N/A

318

Total Mutual Funds

6,996,906

Master Trust

INVESCO

Stable Value Fund

N/A

4,814,311

Kennametal Inc. Common Stock

*

Kennametal

Kennametal Inc. Common Stock

N/A

2,776,343

Total Investments

14,587,560

*

Notes receivable from participants

Maturities from 2011 to 2039, interest rates from 4.25% to 9.50%

N/A

239,217

Total

$

14,826,777

SIGNATURES

THE PLAN. Pursuant to the requirements of the Securities Exchange Act of 1934, the plan administrator of the Kennametal Retirement Income Savings Plan has duly caused this annual report to be signed by the undersigned hereunto duly authorized.