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01-16 GM 6.6L Duramax DHD 12PT Coated Up Pipe Bolt

Not all up pipe bolts are created equal! Its just about impossible to find the correct dimension M10 bolt with the correct shoulder and socket size as factory. Well, not anymore!

DHD's up pipe bolts are designed to be an exact replacement for your rusty or broken OE hardware. These bolts work well on both OE and aftermarket up pipes. Their narrow 19mm flange typically even clears the welds on high flow oversize up pipes.


  • M10 x 1.5 x 30MM
  • Durable Black Coated Finish
  • 12 Point 12MM Socket Sizing
  • 19MM Flange
  • Grade 12.9


  • 2001-2016 Duramax 6.6L Up Pipes
  • 2001-2004 LB7 Downpipe Turbo Flange ( 4 Req'd )

Part Number: 300-128

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Tags: Duramax , DHD , 12PT , Coated , Up , Pipe , Bolt