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 5910-01-289-0912
NSN 6645-01-319-8203
NSN 6620-00-417-6285
NSN 5990-00-283-1324
NSN 5925-00-234-0211
NSN 6110-00-288-4179
NSN 5905-00-924-7171
NSN 5930-00-300-0683
NSN 6685-01-507-1887
NSN 5985-00-339-2318
NSN 5925-01-304-0507
NSN 5895-00-884-5780