Exhibit 32.1

CERTIFICATION UNDER SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Applied Aerospace & Defense, Inc. (the "Company") for the quarter ended June 30, 2026, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, James William Ferguson, III, Chief Executive Officer and Director of the Company, and I, Jeff McRae, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of our knowledge, that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:			/s/ James William Ferguson, III			By:			/s/ Jeff McRae
			James William Ferguson, III						Jeff McRae
			Chief Executive Officer and Director (Principal Executive Officer)						Chief Financial Officer (Principal Financial Officer)
			August 12, 2026						August 12, 2026