Torque specs for Caliper halves bolts

g96818 · 12-29-2019, 09:30 PM

Quote:

Originally Posted by Rusty

That's in the ballpark of what I had posted of 40 lbs. On the chart I linked. 32 ftlbs is for a lubed torque spec, and 40 ftlbs is for a dry torque spec for the same bolt. The factory uses a wet spec because of them using a thread locker of some kind.

The bolts are a 8.8, or a 9.8 class.

There's no marking to determine the grade of the fastener.

I measured the front bolts at 63 ft-lbs.

Didn't feel like there was thread locker, but if so then it would already be dry by now and the torque values would be wrong since those would now be considered the breakaway torque.

According to this video, there's no thread locker on the bolts. skip to 2:50.
https://www.youtube.com/watch?v=artb4VxLaig

front caliper bolts are 63 ft-lbs
rear caliper bolts are 32 ft-lbs

These are definitely not class 8.8 or 9.8 since the head size doesn't match.
The head size for a Class 8.8 M10 is 16 mm and M12 is 18 mm. My caliper bolts are 14mm and 17 mm so these are based off the old standard.

Also the chart you linked to doesn't apply since that chart is for hex head bolts, where as the caliper bolts are hex flange bolts. Hex flange bolts are torqued higher.
https://www.swtc.edu/Ag_Power/diesel...e%20values.pdf

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