A headed externally threaded fastener whose threaded portion is of one nominal diameter with an elliptical neck, directly beneath the head.
NSN 5855-01-540-4797
NSN 5920-01-359-3982
NSN 5985-01-218-5643
NSN 5965-01-603-0118
NSN 6105-00-417-9707
NSN 5975-01-170-4131
NSN 5965-01-522-0404
NSN 5930-00-728-7822
NSN 6320-00-110-8005
NSN 6220-01-258-8185
NSN 5998-01-069-7989
NSN 2925-00-951-0150