Greasing all bolts

23 replies to this topic
  • rbinstoon

Posted April 27, 2007 - 11:42 PM


The thread pitch is taken into account in the nominal diameter of the bolt("D" in the calculation). A smaller bolt will have a smaller thread pitch and therefore a greater mechanical advantage, so when you multiply by .5 for a 1/2" bolt compared to .75 for a 3/4" bolt you are accounting for the difference in thread pitch.

As to fine vs. coarse thread, because a fine thread bolt has shallower threads, it has a larger cross-section that needs to be stretched to achieve the proper bolt tension so it requires higher torque to do it.

The constant K=1.33 in the calculations above is something Rock Crawler uses, but is not included in any other equations I've seen to find bolt torque, so they are increasing torque significantly and I'm not sure why. The coefficient of friction should account for any variation in conditions that would affect final bolt tension.

  • gbalias

Posted April 28, 2007 - 09:24 AM


they might increase cause they build a lot of heaby duty suspensions, etc. maybe they wanna play it safe. hehe.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • rbinstoon

Posted April 28, 2007 - 09:34 AM


If they need more clamping force they should use better bolts, not overtorque the ones they are using, though.

  • gbalias

Posted April 28, 2007 - 12:56 PM



who knows what theyre doing.

Related Content


Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.