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 5925-01-474-5931
NSN 5996-00-329-2886
NSN 5990-00-050-7693
NSN 6130-01-549-1625
NSN 5895-01-361-1741
NSN 6645-01-501-0576
NSN 6240-01-534-4007
NSN 5985-01-270-2817
NSN 6645-01-096-9719
NSN 5960-01-080-3117
NSN 6645-01-505-5772
NSN 6220-01-076-5345