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Herald wheel nut thread size?


jagnut66
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7 hours ago, jagnut66 said:

That seems a rather low torque for wheel nuts?

Best wishes,

Mike.

Haynes, Quote exactly the same. 38-42lb/ft. The Thread is 3/8UNF. BTW. I ran a Tap through some yesterday. Checked a couple of Supplier sites, the max recomended is no more than 48Lb/ft, for a Grade 5 Bolt/Nut. Like yourself, when I first saw it I thought it was a low figure.

Pete

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10 hours ago, jagnut66 said:

That seems a rather low torque for wheel nuts?

thats exactly why so many get stripped or shear off completely  

and why many upgrade to 7/16unf or 12mm studs   you wont shear them 

bear in mind the std torque for a 3/8unf bolt is around 31lbft  so you are already  on higher grade steel studs and nuts for the 38/42 

but any done to a more average 60 will end up on the floor or you loosing a wheel  ...not a good experience 

these design torques are there for a very good reason 

Pete

 

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i would think alloy may deform if there any fretting going on as its softer?  than a steel wheel 

most with allloys up the stud size so that would allow a  higher torque but the stud thread form and nut are the limiting factor 

as most alloy's have a thicker nave  so  need  a longer stud so they up to the 7/16" or M12  studs then 65lbft   is more normal 

Pete

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