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 5945-01-408-2940
NSN 5895-00-394-6875
NSN 5915-01-442-6484
NSN 5895-01-444-5478
NSN 6645-01-527-4456
NSN 5960-01-013-9346
NSN 5960-01-570-8605
NSN 6110-00-202-1021
NSN 6320-01-551-3553
NSN 5998-00-832-6748
NSN 4140-00-288-9826
NSN 5835-01-595-4099