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 6150-00-505-9063
NSN 5915-00-838-2780
NSN 6105-00-078-9372
NSN 2925-00-265-7539
NSN 4140-00-475-5368
NSN 6645-01-290-3930
NSN 5996-00-272-2560
NSN 5925-01-643-5319
NSN 2925-01-136-1095
NSN 6240-00-560-5426
NSN 5855-01-570-3195
NSN 6240-00-372-4841