cliftyhanger
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posted on 3/3/18 at 10:48 AM |
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X rated bolts
Got some bolts holding calipers together. They are X rated, no other symbol. Seem them before on other calipers, so believe them to be OEM.
I am spacing the calipers, so need longer. bolts. What is the modern equivalent grade to X?? Google seems remarkably unhelpful. (could just be me)
Cheers
Clive
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bonzoronnie
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posted on 3/3/18 at 11:30 AM |
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Here is a PDF of the X rating system of bolts
http://www.idot.illinois.gov/Assets/uploads/files/Doing-Business/Manuals-Guides-&-Handbooks/Highways/Materials/Metals/fasteneridentificationguide.
pdf
Not got any cross reference information but would seem that the X rating of bolts is an American bolt standard.
Personally, if in doubt I would just use 12.9 grade bolts
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DW100
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posted on 3/3/18 at 11:31 AM |
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This help?
http://www.idot.illinois.gov/Assets/uploads/files/Doing-Business/Manuals-Guides-&-Handbooks/Highways/Materials/Metals/fasteneridentificationguide.
pdf
[Edited on 3/3/18 by DW100]
Ah beaten to it
[Edited on 3/3/18 by DW100]
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cliftyhanger
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posted on 3/3/18 at 11:37 AM |
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That is the site I found (once I added -browning to the search box)
Sadly it isn't on there, they say X is unrated, which couldn't be true for bolts holding a caliper together.
And the diagrams on the pdf show a relatively small x, on these bolts it uses the whole head and is raised.
I may have to use 12.9 bolts, they should be adequate. Not a place to skimp though!
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SPYDER
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posted on 3/3/18 at 11:53 AM |
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You won't be scrimping by using 12.9 bolts. What calipers are they?
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davew823
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posted on 3/3/18 at 12:45 PM |
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X mark
The "X" mark on top of the bolt is the manufactures ID mark. The X mark does not indicate the grade of the bolt. If there is not any
other marks, then the bolt is low grade, per IFI. Davew823
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cliftyhanger
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posted on 3/3/18 at 05:52 PM |
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quote: Originally posted by SPYDER
You won't be scrimping by using 12.9 bolts. What calipers are they?
Girling type 16PB (metric versions) as fitted to TRr and a few other BL cars of that era. Very similar to M16 except lug spacing, they even use the
same pads.
And I don't think these are a low grade bolt at all. holding the 2 halves of a caliper requires a serious bolt!
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