SC TO-T/A

                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549

                                ------------

                               SCHEDULE TO/A
                               (RULE 14d-100)
               TENDER OFFER STATEMENT UNDER SECTION 14(d)(1)
         OR SECTION 13(e)(1) OF THE SECURITIES EXCHANGE ACT OF 1934
                             (AMENDMENT NO. 4)


                         CORDANT TECHNOLOGIES INC.
                     (Name of Subject Company (Issuer))

                          OMEGA ACQUISITION CORP.
                        A WHOLLY OWNED SUBSIDIARY OF
                                 ALCOA INC.
                    (Names of Filing Persons (Offerors))

                                ------------

             COMMON STOCK, PAR VALUE $1.00 PER SHARE (INCLUDING
             THE ASSOCIATED RIGHTS TO PURCHASE PREFERRED STOCK)
                       (Title of Class of Securities)

                                ------------

                                 218412104
                   (CUSIP Number of Class of Securities)

                         LAWRENCE R. PURTELL, ESQ.
                                 ALCOA INC.
                            201 ISABELLA STREET
                       PITTSBURGH, PENNSYLVANIA 15212
                         TELEPHONE: (412) 553-4545
                   (Name, address and telephone number of
                    person authorized to receive notices
              and communications on behalf of filing persons)

                                  COPY TO:

                          J. MICHAEL SCHELL, ESQ.
                          MARGARET L. WOLFF, ESQ.
                  SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                             FOUR TIMES SQUARE
                             NEW YORK, NY 10036
                          TELEPHONE: 212-735-3000



                             CALCULATION OF FILING FEE
- -----------------------------------------------------------------------------
        Transaction Valuation*                     Amount of Filing Fee
            $2,180,663,478                              $436,132.70
- -----------------------------------------------------------------------------

*   For purposes of calculating the amount of the filing fee only. This
    amount assumes the purchase of (i) 36,714,831 outstanding shares of
    common stock of Cordant Technologies Inc. and (ii) 1,542,423 shares of
    common stock of Cordant Technologies Inc. underlying vested options. The
    amount of the filing fee, calculated in accordance with Rule 0-11 of the
    Securities Exchange Act of 1934, as amended, equals 1/50 of 1% of the
    transaction value.

[_] Check the box if any part of the fee is offset as provided by Rule
    0-11(a)(2) and identify the filing with which the offsetting fee was
    previously paid. Identify the previous filing by registration statement
    number or the Form or Schedule and the date of its filing.

    Amount Previously Paid: N/A            Form or Registration No.: N/A
    Filing party: N/A                      Date Filed: N/A

[_] Check the box if the filing relates solely to preliminary communications
    made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which
the statement relates:

   [X] third-party tender offer subject to Rule 14d-1.

   [_] issuer tender offer subject to Rule 13e-4.

   [_] going-private transaction subject to Rule 13e-3.

   [_] amendment to Schedule 13D under Rule 13d-2.

   Check the following box if the filing is a final amendment reporting the
results of the tender offer: [_]




     This Amendment No. 4 to the Tender Offer Statement on Schedule TO (the
"Schedule TO"), filed initially with the Securities and Exchange Commission
on March 20, 2000, relates to the offer by Omega Acquisition Corp., a
Delaware corporation (the "Purchaser") and a wholly owned subsidiary of
Alcoa Inc., a Pennsylvania corporation ("Alcoa"), to purchase all
outstanding shares of common stock, including the associated rights to
purchase preferred stock (collectively, the "Shares"), of Cordant
Technologies Inc., a Delaware corporation, at a price of $57.00 per Share,
net to the seller in cash, upon the terms and subject to the conditions set
forth in the Purchaser's Offer to Purchase, dated March 20, 2000, and in
the related Letter of Transmittal (which together constitute the "Offer").

ITEMS 1, 4 AND 11.

     Items 1, 4 and 11 are hereby amended and supplemented to add the
following:

     "On May 22, 2000, Alcoa announced the completion of the Offer. The
Offer expired at 5:00 p.m. Eastern Daylight Savings Time on Friday, May 19,
2000, at which time approximately 34,534,734 Shares were validly tendered,
including guaranteed deliveries. After payment for the deposited shares,
Alcoa will own approximately 93.5% of the Shares.

     Alcoa also announced that it will provide a subsequent offering period
of 3 business days for the Offer, which will commence at 9:00 a.m. Eastern
Daylight Savings Time on May 22, 2000 and expire at 11:59 p.m Eastern
Daylight Savings Time on Wednesday, May 24, 2000."

ITEM 12.

   Item 12 is hereby amended and supplemented to add the following exhibit:

   (a)(10)  Press Release, dated May 22, 2000.




                                 SIGNATURE

     After due inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete
and correct.


                                    OMEGA ACQUISITION CORP.


                                    By:  /s/ BARBARA S. JEREMIAH
                                       --------------------------------
                                    Name:  Barbara S. Jeremiah
                                    Title: Vice President


                                    ALCOA INC.


                                    By:  /s/  RICHARD B. KELSON
                                       --------------------------------
                                    Name:  Richard B. Kelson
                                    Title: Executive Vice President and
                                           Chief Financial Officer


Dated: May 22, 2000




                               EXHIBIT INDEX


   (a)(10)  Press Release, dated May 22, 2000.

EX-99

Editorial Contact:      Bonita A. Cersosimo
                        1 412 553 4462

Investor Relations:     Edgar M. Cheely, Jr.
                        Randall J. Killeen
                        1 412 553 2231


    ALCOA COMPLETES CASH TENDER OFFER FOR CORDANT; ANNOUNCES SUBSEQUENT
            OFFERING PERIOD; AND EXTENDS TENDER OFFER FOR HOWMET

      PITTSBURGH, May 22, 2000 -- Alcoa announced today the completion of
its $57 per share cash tender offer for all outstanding shares of common
stock of Cordant Technologies Inc. The tender offer expired at 5:00 p.m.
Eastern Daylight Savings Time (EDST) on Friday, May 19, 2000, at which time
approximately 34,534,734 shares of Cordant common stock were validly
tendered, including guaranteed deliveries. Payment for the shares of
Cordant common stock purchased during the initial offering period will be
made promptly through ChaseMellon Shareholder Services, L.L.C., the
depositary for the tender offer. After payment for the deposited shares,
Alcoa will own approximately 93.5% of the total issued and outstanding
shares of Cordant common stock.

      As previously announced, Alcoa will provide a subsequent offering
period of three business days for the Cordant tender offer, which begins
today at 9:00 a.m. EDST and expires at 11:59 p.m. EDST on Wednesday, May
24, 2000. During this subsequent offering period, shares of Cordant will be
accepted and promptly paid for as they are tendered. The same price paid
during the initial offering is extended through the subsequent offering
period: $57 per share, net to the seller in cash, to Cordant stockholders.
Shares that are tendered during the subsequent offering period may not be
withdrawn.

      Alcoa also announced today that it has extended its $20 per share
cash tender offer for all of the outstanding shares of Howmet International
Inc. The tender offer, as extended, will expire at 5:00 p.m. EDST on June
2, 2000. Alcoa emphasized that it will not under any circumstances extend
the Howmet offer beyond Friday, June 2, 2000. As of the close of business
on May 19, 2000, the number of shares of Howmet common stock that had been
validly tendered was 1,098,100, including guaranteed deliveries.

                                 ###


Alcoa (NYSE: AA)
Cordant Technologies (NYSE: CDD)
Howmet International (NYSE:  HWM)