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Which type of steel is used in bolts?

Stainless steel and low carbon steel hex bolts. Any steel with a high yield strength can be used, but series 4xxx low carbon steel and series 4xx tempered martensitic steel are widely used.

It depends where we are using that bolt

For rough and tough use hight tensile 10.8

For regular industrial general use c45 or En8

And lastly for general use where grading and performance is not the important factor, can use directly Mild steel

Mostly low carbon steel. There are different grades of bolts which can handle different ratings of load and torque:

These are bolts in America, it may be different for other nations.

Medium carbon steel with addition of some alloying elements i.e (Medium Alloy Steel)

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