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 7035-00-392-5417
NSN 5930-00-541-8594
NSN 6320-01-029-4220
NSN 6240-00-765-4220
NSN 6135-00-866-2311
NSN 6135-01-426-8282
NSN 6645-01-017-3593
NSN 2925-01-554-5246
NSN 5960-01-491-2993
NSN 5855-00-610-4052
NSN 5855-01-472-2302
NSN 5945-00-951-9880