jimgiblett
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| posted on 25/3/08 at 10:58 AM |
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Seatbelt / harness mounts thread spec
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
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mike smith1
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| posted on 25/3/08 at 11:04 AM |
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It's 7/16 UNF
Mike
[Edited on 25/3/08 by mike smith1]
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bigrich
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| posted on 25/3/08 at 11:07 AM |
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Yep 7/16 unf
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A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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jimgiblett
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| posted on 25/3/08 at 11:20 AM |
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Thanks guys. I'll go buy a tap.
- Jim
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BenB
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| posted on 25/3/08 at 11:23 AM |
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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...
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02GF74
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| posted on 26/3/08 at 08:00 AM |
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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?
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jimgiblett
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| posted on 26/3/08 at 09:13 PM |
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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
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iank
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| posted on 26/3/08 at 09:55 PM |
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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...
How would that play at SVA? It specifies 11mm 7/16 or larger 8.8 grade as the minimum adequate spec. Even upping the grade to 12.9 isn't
likely to compensate for that great a reduction in diameter [he says without running off and doing the maths  ]
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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vinnievector
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| posted on 27/3/08 at 07:27 PM |
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Hi
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 .
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