Bolt Torque and Wheels

[Jim Garry]

A question about bolt torque. There are some good threads on Apexspeed about this topic but I have a different twist to the question. In re-assembling some wheels the manufacturer stated in a personal email to me that a torque spec of 18 Nm should be used (159 in-lbs). The 6 mm x 1.0 bolts to be used were purchased from McMaster-Carr and are rated as Class 10.9. A search of the many sources of specifications show such bolts to have a max torque value that ranges between 14 to 16 Nm (124 to 142 in-lbs).

Seems to me that despite this particular wheel manufacturer’s recommendations, a bolt's maximum rated value for torque should not be exceeded.


Thoughts?

[DaveW]

A question about bolt torque. There are some good threads on Apexspeed about this topic but I have a different twist to the question. In re-assembling some wheels the manufacturer stated in a personal email to me that a torque spec of 18 Nm should be used (159 in-lbs). The 6 mm x 1.0 bolts to be used were purchased from McMaster-Carr and are rated as Class 10.9. A search of the many sources of specifications show such bolts to have a max torque value that ranges between 14 to 16 Nm (124 to 142 in-lbs).

Seems to me that despite this particular wheel manufacturer’s recommendations, a bolt's maximum rated value for torque should not be exceeded.


Thoughts?

Without any other information, it appears that you are correct. The only thing that "might" require more torque than the bolts are rated for would be a large amount of friction to overcome because of some unusual locking nut type or some other strange condition.

[J Leonard]

Were the OEM bolts class12.9 ?

[DaveW]

Without any other information, it appears that you are correct. The only thing that "might" require more torque than the bolts are rated for would be a large amount of friction to overcome because of some unusual locking nut type or some other strange condition.

Were the OEM bolts class12.9 ?

I'll bet you're correct.

[Jim Garry]

Just this minute the manufacturer responded to my follow up email. Yes, uou are right. They had 12.9 as OE.

Thanks!