<PAGE>

                                                                    Exhibit 24.1
                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                        /s/ Joseph R. Grewe
                                                     ---------------------------
                                                     Joseph R. Grewe

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                       /s/ Walter E. Blankley
                                                     ---------------------------
                                                     Walter E. Blankley

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                       /s/ Peter H. Forster
                                                     ---------------------------
                                                     Peter H. Forster

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                        /s/ Bernard G. Rethore
                                                     ---------------------------
                                                     Bernard G. Rethore

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                        /s/ R. William Van Sant
                                                     ---------------------------
                                                     R. William Van Sant

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                         /s/ William G. Roth
                                                     ---------------------------
                                                     William G. Roth

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                         /s/ Leo W. Ladehoff
                                                     ---------------------------
                                                     Leo W. Ladehoff

<PAGE>

                                POWER OF ATTORNEY

         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 2002;

         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints Byron O. Pond and Francis J. Drew, and each of them, his
true and lawful attorneys-in-fact and agent, with full power of substitution and
resubstitution, to execute in his name, place, and stead, the Company's Annual
Report on Form 10-K for the year ended August 31, 2002, (including an amendment
to such report) and any and all other instruments necessary or incidental in
connection therewith, and to file the same with the Securities and Exchange
Commission. Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned, in the aforesaid capacity, every
act whatsoever necessary or desirable to be done, as fully to all intents and
purposes as the undersigned might or could do in person. The undersigned hereby
ratifies and approves the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument this
15th day of October, 2002.

                                                         /s/ Don R. Graber
                                                     ---------------------------
                                                     Don R. Graber