Australian Standard AS1111. Threads Class 8G. Tensile Strength 400MPa (N/mm2) min. 58000 lbf/in2 min. 25.9 tonf/in2 min. Proof Load Stress 225MPa (N/mm2) min. 2800 lbf/in2 min. 4.6 tonf/in2 min. Hexagon head screws are threaded to within 2 1 /2 pitches of the underside of the head.
