Email PrintMaterial : 1018 Steel or EquivalentHeat Treat : Hardened & GroundFinish : Black Oxide Part No.ABCDEFGHIJK 01-16-0011.252.000.250.301.200.400.311.880.451.601.00 L M R +.0005 - .000 N O P Q S 2.002.50.25000.50 + .00051.40For 5/16-18 or M8 SHCS#10-24 thread, C'Bore 15/64 x 1/2 deep15/64 dia. drill