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 5999-01-578-6827
NSN 6130-01-400-6123
NSN 2925-01-519-3221
NSN 6145-00-240-4532
NSN 5999-00-254-8588
NSN 6135-00-603-4859
NSN 6685-01-546-9509
NSN 6645-00-020-2787
NSN 5998-00-596-9568
NSN 5990-01-069-5795
NSN 5925-00-425-6228
NSN 5960-01-474-4843