t.j.
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| posted on 25/2/07 at 10:30 AM |
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bolt class
Hi,
Can anyone tell me what class bolt are needed for sva in the brackets.
I planning m12 class 8.8. Or does it have to be 10.9 ?
Thxs!
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flak monkey
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| posted on 25/2/07 at 10:34 AM |
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8.8 is fine
Sera
http://www.motosera.com
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DRC INDY 7
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| posted on 25/2/07 at 10:45 AM |
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I have 12.9 as supplied by MK
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t.j.
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| posted on 25/2/07 at 10:51 AM |
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quote:
Originally posted by DRC INDY 7
I have 12.9 as supplied by MK
12.9???????????????
looks like overkill to me.
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DRC INDY 7
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| posted on 25/2/07 at 12:03 PM |
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For suspension on road vehicles they are between 10.9-12.9
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flak monkey
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| posted on 25/2/07 at 12:06 PM |
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8.8 grade bolts are fine for all the suspension bolts on a locost as they are horrendously over specced at M12 anyway.
If you are using M8 bolts for suspension pivots, then I would suggest 12.9 grade SHCS.
Sera
http://www.motosera.com
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macnab
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| posted on 25/2/07 at 01:47 PM |
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I use to fly flex wing microlights, the ones with handglider type wings. The wing is held on by just one rather small bolt! Which not surprisingly
worried me a bit till I found out it was rated to 14 tons! Fine since the plane was only about 200kgs 
I’m also sure I heard that there’s class of M8 bolt that can hold the weight of a 40ton locomotive!
[Edited on 25/2/07 by macnab]
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flak monkey
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| posted on 25/2/07 at 02:02 PM |
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A 12.9 M8 bolt will take 4.5tonnes to break in tension or 4 tonnes to yeild. Which works out at 2.5tonnes in single shear or 5 tonnes in double shear
(as in locost suspension bolts)
An M12 8.8 bolt will take 5.5tonnes in tension before it yeilds, and 3.3tonnes in single shear and 6.6tonnes in double shear...
David
Sera
http://www.motosera.com
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