... drive spikes, T-bolts, fish bolts, switch & crossing bolts, high tensile strength bolts for rail bridges etc.3, Various type and sizes ... ,12.Bolts and nuts:Mechanical Properties1, Material: 40 Cr.2, Tensile strength: Mpa quartile 1220 (magnitude 12.9) .3, Tension loading: N ... Power Station Company part equipment as follows:Hardness: HRC36-42, Tensile strength: 170.000 P. S. I ( 120 Kg /mm 2 ) Elastic ...