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hex head metric gr 12.9 bolts black oxide

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    #16
    They won't allow button heads in FSAE for any important loaded components, distance from the shank to the internal hex was the reasoning as I remember. Looking at ARP, they do 70 and 80mm if you can live with the price and grip length. https://arp-bolts.com/kits/arpkit-de...?RecordID=2948

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      #17
      Originally posted by gxxr View Post
      They won't allow button heads in FSAE for any important loaded components, distance from the shank to the internal hex was the reasoning as I remember. Looking at ARP, they do 70 and 80mm if you can live with the price and grip length. https://arp-bolts.com/kits/arpkit-de...?RecordID=2948
      i emailed ARP the heads are taller than a conventional hex as they have the flange.
      E30 325is M20 3.1L

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