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#1
3rd June 2011, 08:25 PM
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seat belt/harness anchorage?
evening all,
is there anything wrong with using m12 captives rather than 7/16ths stated in the book, had a quick gander at the iva manual thinggy and cant find anything relating to the thread or size of the bolt, what would you guys suggest? Ta Very Much JakeH
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its reight! is not a suitable measurement! 
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#2
3rd June 2011, 08:27 PM
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7/16th is standard for seatbelt mounting bolts. Why do you want to use M12s?
__________________
~ My Build Diary - http://davesroadster.blogspot.com/ *updated 7/6/11* Best bit so far: Getting it running Worst bit so far: Cutting steel for wishbones and engine mounts. Most annoying bit so far: Generator packing up half way through welding.
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#3
3rd June 2011, 08:54 PM
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Quote:
Ta Very Much JakeH
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its reight! is not a suitable measurement!
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#4
3rd June 2011, 09:10 PM
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Just high tensile ones. 8.8 or higher. Not sure about the thread though personally, which is why i went with the 7/16s
__________________
~ My Build Diary - http://davesroadster.blogspot.com/ *updated 7/6/11* Best bit so far: Getting it running Worst bit so far: Cutting steel for wishbones and engine mounts. Most annoying bit so far: Generator packing up half way through welding.
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#5
4th June 2011, 02:39 PM
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7/16 UNF(unified national fine) is the standard used.This is obviously a fine thread.You can also get UNC(unified coarse).There is a genuine reason for using a fine thread although i cant remember what it is/was.
 Personally i would go for the 7/16 UNF or if you cant get them then go for M12 in a fine pitch,M12 by 1.50 pitch as opposed to the standard M12 by 1.75.Although probably easier to get the UNF thread than a metric fine.  (8.8 tensile strength or 12.9)
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#7
6th June 2011, 11:45 PM
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Ozzy
its something to do with fine threads are stronger and less likely to shear its one of those clever/silly/nerdy techno equation things like shear stress and tensile strength stuff. But 7/16 unf is not compulsory for iva you just have to have alternative fixings of adequate/ equal strength to 7/16 unf But it is really easy to get hold a tap and the right drill bit for 7/16 unf choice as they say is yours  HTH les g
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#8
7th June 2011, 02:22 PM
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Finer threads = more surface area = stronger.
TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders
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#9
7th June 2011, 09:57 PM
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Makes lots of sense Les,every pitch is a potential fracture and the finer the better in engineering terms.
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Cost : Little as possible. Thanks : To those who by their generosity my build has progressed. Its a handmade sports car not a flaming kit car !!! If at first you dont succeed,avoid skydiving... No parachute require to freefall,only if you want to do it twice.
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#10
8th June 2011, 09:55 AM
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Quote:
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