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 5990-00-840-6571
NSN 5920-01-593-0042
NSN 6150-01-113-7574
NSN 5855-01-465-6872
NSN 6130-00-370-9172
NSN 5998-01-484-4555
NSN 5998-00-488-3705
NSN 6145-01-423-0906
NSN 5925-01-018-9799
NSN 5895-00-176-5545
NSN 5905-01-054-6951
NSN 5935-01-320-6403