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 5950-01-123-9661
NSN 6145-01-071-0483
NSN 5855-00-951-6483
NSN 6135-01-168-2944
NSN 6645-00-732-7789
NSN 5895-00-067-4968
NSN 5945-01-472-4347
NSN 6150-01-519-9309
NSN 6685-01-284-4540
NSN 6645-01-215-0617
NSN 6150-01-606-8601
NSN 6610-01-195-3497