Thread Size : 0.2500-28UNJF-3B, Width Across Flats (in) : 0.49-0.502, Width Across Corners (in) : 0.557, Shank Height (in) : 0.42, Cap Width (in) : 0.316, Maximum Drill Depth (in) : 0.21, Weight (lbs/100) : 1.1, Ultimate Tensile Strength (lbs/Min) : 4100, Locking Insert : Red Nylon (350?F Max Performance), Performance : NASM25027 as Applicable, Sealing - 80 PSI, Series : K1, Thread Type : UNJF, Thread Notes : AS8879, Thread Squareness : ESNA Spec 405, Group I, Material : Steel, Finish : Cadmium, Finish Classification : Cadmium Plate, SAE AMS-QQ- P-416, Type I, Class 3, Overall Height (in) : 0.449, Hex Height (in) : 0.21