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  1. Bagyo

    Boron Steel for Grade 5 Bolts

    Swall, Thanks for your input. I received grade 5 cap screws from our supplier and when I checked the Material Test Report, the products were made from 10B21 boron steel but the head marking is still with grade 5 not 5.2. The products passed the mechanical testing equivalent to grade 5 as per SAE...
  2. Bagyo

    Boron Steel for Grade 5 Bolts

    Is 10B21 Boron Steel acceptable to be used for Grade 5 Bolts? Where can I find the specification for this? Thanks, Bagyo

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