A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 5905-01-535-0476
NSN 5998-01-640-7207
NSN 5855-01-641-7319
NSN 6105-00-862-3212
NSN 6320-01-365-2701
NSN 5985-00-784-9276
NSN 6240-01-249-5182
NSN 6685-01-521-9897
NSN 5998-00-145-1792
NSN 5950-00-402-9222
NSN 6645-01-327-7362
NSN 6685-00-983-5326