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 6620-01-444-4048
NSN 5998-01-617-2862
NSN 6150-01-651-0213
NSN 5935-01-148-7861
NSN 5996-00-680-9932
NSN 5935-01-432-1166
NSN 6150-01-394-4154
NSN 5925-01-185-9897
NSN 5855-01-131-5166
NSN 6645-01-488-5466
NSN 5960-00-539-7914
NSN 6150-01-088-6539