RickRick
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| posted on 12/5/09 at 08:46 PM |
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seatbelt bolts
I've just recived some 7/16th unf bolts ordered online for my seatbelts, described as grade S supplied marked L with 3 lines equaly spaced. I
belive mr sva wont like these. does anyone have a table of bolt strength using letters for imperial bolts
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coozer
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| posted on 12/5/09 at 08:51 PM |
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Go down the srappy.. I got mine out the front of a Ford Ka. Stamped correctly and correct 7/16th thread.
1972 V8 Jago
1980 Z750
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RickRick
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| posted on 12/5/09 at 08:52 PM |
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i need 2.5 inch long bolts to get my belts up above the seat line not sure i'll get them from a scrappy, and i bought these specificaly for
the S marking just need to confirm L is lower strength than S before i kick off
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matt_claydon
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| posted on 12/5/09 at 09:05 PM |
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quote:
Bolts used in structural areas should be of grade 8.8 or better. Such bolts will be marked 8.8 or 12.9 on the hexagonal head, however, cap-head
bolts or 7/16" ( 11mm ) UNF seat belt anchorage bolts (with an anodised finish) not marked in this way may normally be considered to be of
equivalent strength. Bolts should be M8 or larger.
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f1ngers
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| posted on 12/5/09 at 10:04 PM |
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Are you sure thats grade S and not grade 5? The 3 equally spaced lines denote grade 5 which is equivalent to 8.8. The L is probably the manufacturers
mark.
This chart shows grade 5 and 8.8 and their specifications.
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BenB
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| posted on 12/5/09 at 10:04 PM |
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Silly thing is racing spec harnesses use 8mm 12.9 bolts. A 7/16" bolt is 11mm so unless it's made from chocolate it'll be strong
enough even if less than 8.8 grade....
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blakep82
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| posted on 12/5/09 at 10:51 PM |
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it'll be equivalent strength. another one of those rules people think it MUST be 7/16 UNF, and it doesn't have to be
________________________
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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MikeCapon
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| posted on 13/5/09 at 07:03 AM |
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quote:
Originally posted by matt_claydon
quote:
Bolts used in structural areas should be of grade 8.8 or better. Such bolts will be marked 8.8 or 12.9 on the hexagonal head, however, cap-head
bolts or 7/16" ( 11mm ) UNF seat belt anchorage bolts (with an anodised finish) not marked in this way may normally be considered to be
of equivalent strength. Bolts should be M8 or larger.
Anodised????  Who wrote this? Am I right in thinking this is the SVA or IVA requirement. AFAIK anodising is a surface treatment that is applied
exclusively to aluminium.
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BenB
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| posted on 13/5/09 at 10:28 AM |
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Yes, presumably they're getting confused between anodizing and electroplating. Anodizing is increasing the thickness of the oxide layer (and
sometimes staining it) to improve resistance to rust. Obviously it is only a good idea for some metals- increasing the oxide layer on the outside of a
steel workpiece would be a bad thing!!! IIRC it's done on metals like Ali, titanium, zinc, magnesium, stuff like that....
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