Item is 3 3/4 inch long; called standoff, 3-3/4 inch
A standoff with one threaded end and projection on the other end which can be snapped, press fitted or locked into position.
NSN 5996-01-218-0522
NSN 6320-00-908-6841
NSN 5895-00-071-2555
NSN 6220-00-852-8317
NSN 5920-00-811-9677
NSN 6650-01-212-3964
NSN 6685-01-326-2543
NSN 6610-01-045-1823
NSN 5925-00-179-8327
NSN 5990-00-956-6297
NSN 5920-00-974-4381
NSN 6220-01-427-2333