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  1. djwt

    Look for ideas for material choices, 4140 vs 4340

    I am looking for opinion n thebest route to follow in regards to a process and material choice. The part is a guide pin that I need to have a surface hardness of HRC 46, with surface roughness in the range of (Ra) 32 micro inch or better. It wouldn't be a problem if I could find a shop to do...

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