... , timber drive spikes, T-bolts, fish bolts, switch & crossing bolts, high tensile strength bolts for rail bridges etc.3, ... was 10.9, 12.9 grade steel bolts. Steel bolts for the main power system, the machinery ... all kinds of high quality products such as bolts, high strength bolts, screws, nuts, threaded rod, anchor bolt ... ,8.8,10.9, A2,A4 Inch.size: Gr2, Gr5,Gr8, A307Surface: SELF COLOUR, BLACK,ZP ...