A headed externally threaded fastener whose threaded portion is of one nominal diameter with a single rectangular or triangular projection on the underside of the head.
NSN 5925-00-809-5627
NSN 5835-00-013-9271
NSN 5835-00-920-7325
NSN 6105-01-144-0596
NSN 6110-00-530-3779
NSN 2925-01-486-8527
NSN 5905-01-215-1546
NSN 5855-00-361-0167
NSN 6240-00-519-3399
NSN 6685-01-241-1286
NSN 5905-01-591-4015
NSN 6685-01-377-4716