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 6645-01-142-4574
NSN 6145-01-345-8981
NSN 5999-01-366-9925
NSN 5855-00-610-4052
NSN 6130-00-912-8073
NSN 6645-01-067-4081
NSN 6320-00-506-2314
NSN 6610-01-203-8098
NSN 6130-01-573-5611
NSN 6110-01-065-0232
NSN 5895-01-312-8015
NSN 5905-01-408-5274