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                                                                     Exhibit 4.1

             TWENTY-FIRST AMENDMENT TO CREDIT AGREEMENT AND CONSENT

                  THIS TWENTY-FIRST AMENDMENT TO CREDIT AGREEMENT AND CONSENT
(this "Amendment"), dated as of July 18, 2001 is by and between KAISER ALUMINUM
& CHEMICAL CORPORATION, a Delaware corporation (the "Company"), KAISER
ALUMINUM CORPORATION, a Delaware corporation (the "Parent Guarantor"), the
various financial institutions that are or may from time to time become parties
to the Credit Agreement referred to below (collectively, the "Lenders" and,
individually, a "Lender"), and Bank of America, N.A. (successor to BankAmerica
Business Credit, Inc., a Delaware corporation), as agent (in such capacity,
together with its successors and assigns in such capacity, the "Agent") for the
Lenders. Capitalized terms used, but not defined, herein shall have the meanings
given to such terms in the Credit Agreement, as amended hereby.

                              W I T N E S S E T H:

                  WHEREAS, the Company, the Parent Guarantor, the Lenders and
the Agent are parties to the Credit Agreement, dated as of February 15, 1994, as
amended by the First Amendment to Credit Agreement, dated as of July 21, 1994,
the Second Amendment to Credit Agreement, dated as of March 10, 1995, the Third
Amendment to Credit Agreement and Acknowledgement, dated as of July 20, 1995,
the Fourth Amendment to Credit Agreement, dated as of October 17, 1995, the
Fifth Amendment to Credit Agreement, dated as of December 11, 1995, the Sixth
Amendment to Credit Agreement, dated as of October 1, 1996, the Seventh
Amendment to Credit Agreement, dated as of December 17, 1996, the Eighth
Amendment to Credit Agreement, dated as of February 24, 1997, the Ninth
Amendment to Credit Agreement and Acknowledgment, dated as of April 21, 1997,
the Tenth Amendment to Credit Agreement and Assignment, dated as of June 25,
1997, the Eleventh Amendment to Credit Agreement and Limited Waivers, dated as
of October 20, 1997, the Twelfth Amendment to Credit Agreement, dated as of
January 13, 1998, the Thirteenth Amendment to Credit Agreement, dated as of July
20, 1998, the Fourteenth Amendment to Credit Agreement, dated as of December 11,
1998, the Fifteenth Amendment to Credit Agreement, dated as of February 23,
1999, the Sixteenth Amendment to Credit Agreement, dated as of March 26, 1999,
the Seventeenth Amendment to Credit Agreement, dated as of September 24, 1999,
the Eighteenth Amendment to Credit Agreement, dated as of February 11, 2000, the
Nineteenth Amendment to Credit Agreement and Limited Waiver, dated as of
December 27, 2000, and the Twentieth Amendment to Credit Agreement dated as of
January 26, 2001 (the "Credit Agreement"); and

                  WHEREAS, the parties hereto have agreed to amend the Credit
Agreement as herein provided;

                  NOW, THEREFORE, the parties hereto agree as follows:

        Section 1.        Amendments to Credit Agreement.

        1.1      Amendment to Article I: Definitions and Accounting Terms

        Section 1.1 of the Credit Agreement is hereby amended by
deleting the reference to "August 15, 2001" each time it appears in the
definitions of "Revolving Commitment Termination Date" and "Stated Maturity
Date" contained therein and substituting a reference to "November 2, 2001"
therefor.

        1.2      Amendment to Article V: Letters of Credit

        Section 5.1 of the Credit Agreement is hereby amended by
deleting the reference to "August 15, 2001" contained in clause (b)(iii)
thereof and substituting a reference to "November 2, 2001" therefor.

        1.3      Amendments to Article IX: Covenants

        Section 9.1 of the Credit Agreement is hereby amended by
adding the following as new Section 9.1.13 thereof:

        "SECTION 9.1.13. SALE PROCEEDS ACCOUNT. The Company shall, on
the date of receipt of the cash proceeds from the sale of the 8.2778%
interest in QAL permitted by the Twenty-First Amendment to Credit Agreement
and Consent dated as of July 18, 2001 (the "Twenty-First Amendment"), deposit
50% of such cash proceeds in Account No. 876636 maintained by the Company
with Bank of America pursuant to a control agreement in form and substance
satisfactory to the Agent, which agreement shall (i) confirm the Agent's
security interest in such account, (ii) provide for the investment of amounts
in such account in cash and Cash Equivalent Investments as directed from time
to time by the Company, and (iii) provide that the Company shall have no
right to withdraw funds from such account until the earliest of (A) receipt
of the consent of all Lenders to such withdrawal, (B) November 2, 2001, or
(C) the renewal or refinancing of this Agreement; provided, however, that the
extension of the Revolving Commitment Termination Date and the Stated
Maturity Date effected by the Twenty-First Amendment shall not constitute
such a renewal or refinancing."

        1.4      Amendment to Article X. Defaults

        Section 10.1.3 of the Credit Agreement is hereby amended by adding
   the phrase "9.1.13," prior to the phrase "9.2.4," contained therein.

        Section 2.       Consent

        The Company has informed the Agent and the Lenders that the
Company and KAAC intend to sell an 8.2778% interest in QAL for a purchase
price of approximately $189,000,000, consisting of approximately $159,000,000
of cash and the assumption of approximately $30,000,000 of off-balance sheet
Indebtedness. At the request of the Company, the Lenders hereby consent to
such sale notwithstanding the provisions of Section 9.2.11 of the Credit
Agreement.

        Section 3.        Conditions to Effectiveness

        This Amendment shall become effective as of the date hereof
only when the following conditions shall have been satisfied and notice thereof
shall have been given by the Agent to the Parent Guarantor, the Company and each
Lender (the date of satisfaction of such conditions and the giving of such
notice being referred to herein as the "Twenty-First Amendment Effective Date"):

                A. The Agent shall have received for each Lender counterparts
hereof duly executed on behalf of the Parent Guarantor, the Company, the Agent
and the Lenders (or notice of the approval of this Amendment by the Lenders
satisfactory to the Agent shall have been received by the Agent).

                B. The Agent shall have received:

                        (1)  Resolutions of the Board of Directors or of the
                  Executive Committee of the Board of Directors of the Company
                  and the Parent Guarantor approving and authorizing the
                  execution, delivery and performance of this Amendment,
                  certified by their respective corporate secretaries or
                  assistant secretaries as being in full force and effect
                  without modification or amendment as of the date of execution
                  hereof by the Company or the Parent Guarantor, as the case
                  may be;

                        (2)  A signature and incumbency certificate of the
                  officers of the Company and the Parent Guarantor executing
                  this Amendment;

                        (3)  For each Lender, an opinion, addressed to the Agent
                  and each Lender, from Kramer Levin Naftalis & Frankel LLP, in
                  form and substance satisfactory to the Agent;

                        (4)  Such other information, approvals, opinions,
                  documents or instruments as the Agent may reasonably request;
                  and

                        (5)  For the pro rata benefit of the Lenders, a fee in
                  the amount of $100,000.

                Section 4.        Company's Representations and Warranties.

                In order to induce the Lenders and the Agent to enter into
this Amendment and to amend the Credit Agreement in the manner provided herein,
the Parent Guarantor and the Company represent and warrant to each Lender and
the Agent that, as of the Twenty-First Amendment Effective Date, after giving
effect to the effectiveness of this Amendment, the following statements are true
and correct in all material respects:

                        A. Authorization of Agreements. The execution and
delivery of this Amendment by the Company and the Parent Guarantor and the
performance of the Credit Agreement as amended by this Amendment (the "Amended
Agreement") by the Company and the Parent Guarantor are within such Obligor's
corporate powers and have been duly authorized by all necessary corporate action
on the part of the Company and the Parent Guarantor, as the case may be.

                        B. No Conflict.  The execution and delivery by the
Company and the Parent Guarantor of this Amendment and the performance by the
Company and the Parent Guarantor of the Amended Agreement do not:

                                (1) contravene such Obligor's Organic Documents;

                                (2) contravene the Senior Indenture, the New
                  Senior Indenture, the Additional New Senior Indenture, or the
                  Subordinated Indenture or contravene any other contractual
                  restriction where such a contravention has a reasonable
                  possibility of having a Materially Adverse Effect or
                  contravene any law or governmental regulation or court decree
                  or order binding on or affecting such Obligor or any of its
                  Subsidiaries; or

                                (3) result in, or require the creation or
                  imposition of, any Lien on any of such Obligor's properties or
                  any of the properties of any Subsidiary of such Obligor, other
                  than pursuant to the Loan Documents.

                        C.  Binding Obligation.  This Amendment has been duly
executed and delivered by the Company and the Parent Guarantor and this
Amendment and the Amended Agreement constitute the legal, valid and binding
obligations of the Company and the Parent Guarantor, enforceable against the
Company and the Parent Guarantor in accordance with their respective terms,
except as may be limited by bankruptcy, insolvency, reorganization, moratorium
or similar laws relating to or limiting creditors' rights generally and by
general principles of equity.

                        D.  Governmental Approval, Regulation, etc.  No
authorization or approval or other action by, and no notice to or filing with,
any governmental authority or regulatory body or any other Person is required
for the due execution, delivery or performance of this Amendment by the Company
or the Parent Guarantor.

                        E.  Incorporation of Representations and Warranties from
Credit Agreement.  Each of the statements set forth in Section 7.2.1 of
the Credit Agreement is true and correct.

                Section 5.        Acknowledgement and Consent.

                The Company is a party to the Company Collateral Documents, in
each case as amended through the date hereof, pursuant to which the Company has
created Liens in favor of the Agent on certain Collateral to secure the
Obligations. The Parent Guarantor is a party to the Parent Collateral Documents,
in each case as amended through the date hereof, pursuant to which the Parent
Guarantor has created Liens in favor of the Agent on certain Collateral and
pledged certain Collateral to the Agent to secure the Obligations of the Parent
Guarantor. Certain Subsidiaries of the Company are parties to the Subsidiary
Guaranty and/or one or more of the Subsidiary Collateral Documents, in each case
as amended through the date hereof, pursuant to which such Subsidiaries have (i)
guarantied the Obligations and/or (ii) created Liens in favor of the Agent on
certain Collateral. The Company, the Parent Guarantor and such Subsidiaries are
collectively referred to herein as the "Credit Support Parties", and the Company
Collateral Documents, the Parent Collateral Documents, the Subsidiary Guaranty
and the Subsidiary Collateral Documents are collectively referred to herein as
the "Credit Support Documents".

                Each Credit Support Party hereby acknowledges that it has
reviewed the terms and provisions of the Credit Agreement as amended by this
Amendment and consents to the amendment of the Credit Agreement effected as of
the date hereof pursuant to this Amendment.

                Each Credit Support Party acknowledges and agrees that any of
the Credit Support Documents to which it is a party or otherwise bound shall
continue in full force and effect. Each Credit Support Party hereby confirms
that each Credit Support Document to which it is a party or otherwise bound and
all Collateral encumbered thereby will continue to guaranty or secure, as the
case may be, the payment and performance of all obligations guaranteed or
secured thereby, as the case may be.

                Each Credit Support Party (other than the Company and the
Parent Guarantor) acknowledges and agrees that (i) notwithstanding the
conditions to effectiveness set forth in this Amendment, such Credit Support
Party is not required by the terms of the Credit Agreement or any other Loan
Document to consent to the amendments to the Credit Agreement effected pursuant
to this Amendment and (ii) nothing in the Credit Agreement, this Amendment or
any other Loan Document shall be deemed to require the consent of such Credit
Support Party to any future amendments to the Credit Agreement.

                Section 6.        Miscellaneous.

                        A. Reference to and Effect on the Credit Agreement and
the Other Loan Documents.

                                (1)   On and after the Twenty-First Amendment
                  Effective Date, each reference in the Credit Agreement to
                  "this Agreement", "hereunder," "hereof," "herein" or words of
                  like import referring to the Credit Agreement, and each
                  reference in the other Loan Documents to the "Credit
                  Agreement," "thereunder," "thereof" or words of like import
                  referring to the Credit Agreement shall mean and be a
                  reference to the Amended Agreement.

                                (2)   Except as specifically amended by this
                  Amendment, the Credit Agreement and the other Loan Documents
                  shall remain in full force and effect and are hereby ratified
                  and confirmed.

                        B. Applicable Law.  THIS AMENDMENT SHALL BE DEEMED TO BE
A CONTRACT MADE UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW
YORK, WITHOUT GIVING EFFECT TO SUCH LAWS RELATING TO CONFLICTS OF LAWS.

                        C. Headings.  The various headings of this Amendment are
inserted for convenience only and shall not affect the meaning or interpretation
of this Amendment or any provision hereof.

                        D. Counterparts.  This Amendment may be executed by the
parties hereto in several counterparts and by the different parties on separate
counterparts, each of which shall be deemed to be an original and all of which
shall constitute together but one and the same instrument; signature pages may
be detached from multiple separate counterparts and attached to a single
counterpart so that all signature pages are physically attached to the same
document.

                        E. Severability.  Any provision of this Amendment which
is prohibited or unenforceable in any jurisdiction shall, as to such provision
and such jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions of this Amendment
or affecting the validity or enforceability of such provisions in any other
jurisdiction.

                  IN WITNESS WHEREOF, this Amendment has been duly executed and
delivered as of the day and year first above written.

KAISER ALUMINUM CORPORATION                 KAISER ALUMINUM & CHEMICAL
                                            CORPORATION

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

BANK OF AMERICA, N.A. (successor to         BANK OF AMERICA, N.A. (successor to
BankAmerica Business Credit, Inc.),         BankAmerica Business Credit, Inc.)
as Agent

By:  /S/ MICHAEL J. JASAITIS                By:  /S/ MICHAEL J. JASAITIS
Name: Michael J. Jasaitis                   Name: Michael J. Jasaitis
Its: Vice President                         Its: Vice President

THE CIT GROUP/BUSINESS                      HELLER FINANCIAL, INC.
CREDIT, INC.

By:  /S/ NEAL T. LEGAN                      By:  /S/ RICHARD J. HOLSTON
Name Printed:  Neal T. Legan                Name Printed:  Richard J. Holston
Its:  Vice President                        Its:  Assistant Vice President

CONGRESS FINANCIAL CORPORATION              TRANSAMERICA BUSINESS CAPITAL
(WESTERN)                                   CORPORATION

By:  /S/ GARY D. CASSIANNI                  By:  /S/ ARI KAPLAN
Name Printed:  Gary D. Cassianni            Name Printed:  Ari Kaplan
Its:   Vice President                       Its:  Vice President

LA SALLE BANK NATIONAL                      ABN AMRO BANK N.V.
ASSOCIATION (formerly known as
La Salle National Bank)                     By:  /S/ JEFFREY DODD
                                            Name Printed:  Jeffrey Dodd
                                            Its:  Group Vice President
By:  /S/ DOUGLAS C. COLLETTI
Name Printed:  Douglas C. Colletti          By: /S/ L. DAVID WRIGHT
Its:  First V.P.                            Name Printed:  L. David Wright
                                            Its:  Senior Vice President

ACKNOWLEDGED AND AGREED TO:

AKRON HOLDING CORPORATION                   KAISER ALUMINUM & CHEMICAL
                                            INVESTMENT, INC.

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

KAISER ALUMINUM PROPERTIES,                 KAISER ALUMINUM TECHNICAL
INC.                                        SERVICES, INC.

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

OXNARD FORGE DIE COMPANY, INC.              KAISER ALUMINIUM
INTERNATIONAL, INC.

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

KAISER ALUMINA AUSTRALIA                    KAISER FINANCE CORPORATION
CORPORATION

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

ALPART JAMAICA INC.                         KAISER JAMAICA CORPORATION

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

KAISER BAUXITE COMPANY                      KAISER EXPORT COMPANY

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

KAISER MICROMILL HOLDINGS, LLC              KAISER SIERRA MICROMILLS, LLC

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed: David A. Cheadle
Its:  Assistant Treasurer                   its: Assistant Treasurer

KAISER TEXAS SIERRA MICROMILLS,             KAISER TEXAS MICROMILL
LLC                                         HOLDINGS, LLC

By:  /S/ DAVID A. CHEADLE                   By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle             Name Printed:  David A. Cheadle
Its:  Assistant Treasurer                   Its:  Assistant Treasurer

KAISER BELLWOOD CORPORATION

By:  /S/ DAVID A. CHEADLE
Name Printed:  David A. Cheadle
Its:  Assistant Treasurer
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