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 6645-01-411-5657
NSN 5895-01-502-9453
NSN 6650-01-483-2399
NSN 5925-01-332-1035
NSN 6240-00-485-6012
NSN 6610-00-548-3452
NSN 5998-01-168-3821
NSN 6685-01-359-9166
NSN 6685-01-366-6956
NSN 6145-00-492-3221
NSN 5910-00-299-4930
NSN 6135-00-134-6648