Anyone know the thread spec on seatbelt / harness mounts. Is it 7/16 fine?
My rollbar is going for powder coating and I will need to retap the harness mounts and thus need to buy the correct relevant size.
Thanks in advance
- Jim
It's 7/16 UNF
Mike
[Edited on 25/3/08 by mike smith1]
Yep 7/16 unf
Thanks guys. I'll go buy a tap.
- Jim
It is very likely to be 7/16 UNF
but.......
some harnesses are now M8 12.9
Guess how I know this
It's normally quite easy to tell the difference between the two though as 7/16 UNF is significantly bigger than M8...
7/16 UNF (just a smidge over 11 mm)
now 8 mm?!?!?! that is 52 % of area of 7/16, no wonder the specify a stronger bolt!!!
Is opening out the harness holes to 12 mm and using 12 mm bolts a terrible suggestion?
Yep 7/16th but the local factors want £20+VAT for the tap so I might just drop it off at the machine shop after it has been powdercoated to clean the
threads out.
- Jim
quote:
Originally posted by BenB
It is very likely to be 7/16 UNF
but.......
some harnesses are now M8 12.9
Guess how I know this![]()
It's normally quite easy to tell the difference between the two though as 7/16 UNF is significantly bigger than M8...
Some quick info on UNF 7/16 according to my trusted Zeus book.
if you want to tap a new hole you require a 9.9 mm drill if you , want to drill a clearance hole then you will need a 11.2 mm hope this helps .