Reccomended Bolt Torque

Maintenance, Repair, Equipment & Tools
1

The question of how tight a given bolt comes up a lot on the forums so I thought I’d share what I found in Volvo VIDA software a while back. These values are for aluminum threads and I’m going I’m going to assume the values compensate for some vibration.

Bolt torque and clamping force is a complex topic, so if you decide to use these values, it is at your own risk. I’m not recommending these values as such, just sharing the info I found.

in-lb in red as I’ve heard stories of folks accidentally setting their lbft torque wrenches to those values :open_mouth:

image

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2

Are these numbers sort of universal? So if I can identify the bolt type on my rig, torque to that?

3

Seems pretty standard, crankcase bolts and headbolts for tm kz is 10nm with M6 size

4

Uh oh. Those are the torque specifications for that bolt screwed into a steel nut.

Tighten them to that specification into an aluminum or magnesium casting and you’ll pull the threads right out.

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5

Maybe you can provide a reference because these are specified for bolts in an aluminum engine.

Block, head, intake, front chain cover etc, all of the steel bolts screwed into aluminum. I would imagine if these numbers are for steel nuts I’d have over 100 stripped threads at this point.

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7

In the X30 manual the tightening torques are fairly consistent for various fastener sizes

M5 5-6Nm
M6 8-10Nm
M8 18-22Nm

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8

This matches what I’ve been using. Thank you for posting.

I wish kart and component manufacturers posted this so that there wasn’t any ambiguity.