A soft metal or nonmetal sleeve, designed to mate with a pin-rivet. it may include an external wrenching facility which breaks off at a perdetermined torque to form a head.
NSN 6610-01-331-2070
NSN 5915-01-133-1654
NSN 5910-01-070-9633
NSN 5965-01-372-2479
NSN 5855-01-222-1242
NSN 6240-01-166-4517
NSN 6145-01-421-2458
NSN 5975-01-052-3489
NSN 5905-00-835-7739
NSN 6645-00-754-4108
NSN 5915-01-015-2486
NSN 5999-00-406-8771