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 6240-01-139-9768
NSN 6105-00-854-4575
NSN 6240-01-327-3239
NSN 6135-01-500-0572
NSN 5910-01-563-3880
NSN 6645-01-420-6804
NSN 5996-01-197-7005
NSN 5895-01-382-2773
NSN 7035-00-870-0290
NSN 6610-01-393-1141
NSN 6220-00-487-0403
NSN 6130-00-118-6185