gy351100
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| posted on 23/1/09 at 07:20 PM |
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SVA and bolt specifications
Hi all
Why can we not use grade "S" bolts instead of grade "8.8" as they are of the same tensile strength.
I have built my car to use UNF bolts which, as I understand, are only available in grade"S"
Metric bolts are in grade "8.8" but not all nearest equivalent sizes are compatible.
I can find no reference to grade "8.8" in the inspection manual eccept for the seat belt mounting
[Edited on 23/1/09 by gy351100]
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blakep82
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| posted on 23/1/09 at 07:23 PM |
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i'm sure it says 'equivalent strength' doesn't it?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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gy351100
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| posted on 23/1/09 at 07:27 PM |
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SVA bolts
Hi
But where in the manual does it say "equivalent strength"?
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blakep82
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| posted on 23/1/09 at 07:34 PM |
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it says
"A suitable single bolt fixing of adequate strength would be, for example a bolt of at least 11mm (7/16" diameter of grade
8.8"
fail point is a bolt of inadequate strength
it just says for example, fo find out what tensile strength an 8.8 grade metric bolt is, and then find a imperial bolt with a higher tensile
strength.
or make an exception, and make your selt belt bolts metric (M12) to make it easier
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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James
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| posted on 24/1/09 at 12:55 AM |
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quote:
Originally posted by gy351100
Hi all
Why can we not use grade "S" bolts instead of grade "8.8" as they are of the same tensile strength.
I have built my car to use UNF bolts which, as I understand, are only available in grade"S"
Metric bolts are in grade "8.8" but not all nearest equivalent sizes are compatible.
I can find no reference to grade "8.8" in the inspection manual eccept for the seat belt mounting
[Edited on 23/1/09 by gy351100]
Would it be a silly question to ask why you build the car this way? Is standard metric really so bad? 
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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