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 6650-01-436-3478
NSN 5920-00-827-1094
NSN 5920-01-321-9402
NSN 6685-00-788-6115
NSN 6620-01-394-7526
NSN 5990-00-835-5211
NSN 6610-01-260-6320
NSN 5905-01-516-8733
NSN 5950-00-008-4579
NSN 5915-01-630-8004
NSN 5855-01-425-1330
NSN 5905-01-033-1110