... Material:Carbon Steel,Alloy Steel 1> Description: High strength bolt, tension control bolt, T. C Bolt 2> Material: Alloy Steel 3> ... high strength bolt Cover, A325 Tension Control Bolt (T. C Bolt) A449 Tension Control Bolt( T. C Bolt) A490 Tension Control Bolt(T. C Bolt) For ... , Tensile strength: Mpa quartile 1220 (magnitude 12.9) .3, Tension loading: N quartile 40600 N.4, Adjusting quality: HRC34 °- 39 ...