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 4140-01-501-5631
NSN 6610-01-221-2606
NSN 5915-01-581-5234
NSN 6610-01-052-8029
NSN 6610-01-234-9098
NSN 5905-01-051-6031
NSN 5925-00-930-2265
NSN 6620-01-156-4641
NSN 6135-00-660-8654
NSN 4140-00-229-8467
NSN 5835-01-173-8003
NSN 5965-01-528-4531