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 5920-01-252-8083
NSN 5915-00-441-9668
NSN 5950-00-810-9295
NSN 5930-00-600-8833
NSN 6645-00-731-8171
NSN 6220-01-595-2004
NSN 5999-00-276-9299
NSN 5975-00-719-9793
NSN 6620-01-106-3553
NSN 6135-01-205-5965
NSN 5925-00-238-0412
NSN 5945-01-388-4083