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 6610-01-053-0061
NSN 6105-01-261-3046
NSN 5855-01-188-4049
NSN 6220-01-542-4671
NSN 6135-00-866-2311
NSN 5985-00-540-1964
NSN 6645-00-285-8781
NSN 6145-01-430-2784
NSN 6130-01-377-8180
NSN 6645-01-467-9983
NSN 5930-00-451-4739
NSN 6130-01-055-6846