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