U-21 series acft
A circular item, usually having a flat or grooved flange, boss(es), and/or counterbore designed to accommodate the end of the spring. It is used to position the spring, but does not encase the spring or restrain lateral motion. It may be used in conjunction with a retainer, helical compression spring. Excludes washer (1), (as modified); seat, ball socket and holder, spring. See also rotor, engine poppet valve.
NSN 5835-00-113-6090
NSN 5975-01-577-9998
NSN 2925-00-679-8131
NSN 6150-01-246-6291
NSN 6105-01-609-5870
NSN 5945-01-114-7022
NSN 5915-01-429-0210
NSN 5950-01-013-9382
NSN 5835-01-250-2939
NSN 6610-01-086-5334
NSN 2925-01-643-8395
NSN 5855-01-441-0401