Thread Size : 0.1120-40UNJC-3B, Width Across Flats (in) : 0.181-0.189, Width Across Corners (in) : 0.207, Locking Insert : Red Nylon (350?F Max Performance), Series : 1660, Thread Type : UNJC, Thread Notes : MIL-S-7742 or AS8879, Material : Brass, Material Rating : Commercial Half Hard or Equivalent, Finish : Cadmium, Finish Classification : Post-Plate, Cadmium Plate, SAE-AMS-QQ-P416 Type II, Class 2, Overall Height (in) : 0.11, Hex Height (in) : 0.07