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351M Pinbox Torque Specs

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  • 351M Pinbox Torque Specs

    Can anyone advise what are the 351M Pinbox Torque Specs?

    TIA
    Curtis, Christine, Cole, and Charlotte
    2007 Chevrolet Silverado Duramax LBZ, CCLB
    2020 Momentum 351M
    2004 Essex Vortex

  • #2
    Curtis

    I found this on E-Trailer.

    1/2 inch Bolts GR5 90 ft-lbs
    5/8 inch Bolts GR5 150 ft-lbs
    3/4 inch Bolts GR5 275 ft-lbs

    This is for the 1621 pin box which I think is the one you have.

    Brian
    Brian & Michelle
    2018 Reflection 29RS
    2022 Chevy 3500HD

    Comment


    • #3
      Thank you!
      Curtis, Christine, Cole, and Charlotte
      2007 Chevrolet Silverado Duramax LBZ, CCLB
      2020 Momentum 351M
      2004 Essex Vortex

      Comment


      • #4
        Just out of curiosity, does 275 seem high for a grade 5 bolt?
        Curtis, Christine, Cole, and Charlotte
        2007 Chevrolet Silverado Duramax LBZ, CCLB
        2020 Momentum 351M
        2004 Essex Vortex

        Comment


        • #5
          Here is a Fastenal chart Torque-Tension Reference Guide.pdf (fastenal.com)

          Portland Bolt » Bolt Torque Chart (portlandbolt.com)

          Brian
          Brian & Michelle
          2018 Reflection 29RS
          2022 Chevy 3500HD

          Comment


          • #6
            So if I'm reading the charts correctly (which I may not) 275 is too high for 3/4” grade 5 bolts.
            Curtis, Christine, Cole, and Charlotte
            2007 Chevrolet Silverado Duramax LBZ, CCLB
            2020 Momentum 351M
            2004 Essex Vortex

            Comment


            • #7
              Those torques are maximum for the fastener strength. Torque for a particular joint strength may be less.

              Here is a ref. from lci

              ccd_0001812.pdf
              Attached Files
              Ted
              2021 Reflection 310RLS
              2020 F350 PS,CC,LB,SRW

              Comment

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