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 6130-01-326-8696
NSN 6685-01-214-3690
NSN 5930-01-480-2608
NSN 6320-00-456-0836
NSN 5930-01-109-8253
NSN 6645-00-415-6032
NSN 5998-00-944-0426
NSN 6685-00-133-4778
NSN 2925-01-036-4213
NSN 6130-01-311-9995
NSN 5975-01-472-7211
NSN 6145-01-539-0473