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 6110-00-607-3027
NSN 6645-01-273-2462
NSN 5990-01-623-0082
NSN 5985-00-257-9490
NSN 6240-01-519-0507
NSN 5905-00-684-4999
NSN 5998-01-377-0125
NSN 5930-00-973-0026
NSN 6150-01-325-9872
NSN 5950-01-027-1269
NSN 5925-01-107-9882
NSN 6620-01-266-1663