richardm6994
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| posted on 12/12/14 at 08:56 AM |
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what thread size is this....
I've got the bolt and I'm trying to source a tap but I'm unsure if it's 3/8 bsf or m11.....
measuring with a pair of cheap digital calipers;
thread od = 10.95mm
10 threads = 12.6mm
I can't get the jaws of the calipers properly inside the thread to measure the inner diameter but at best I recon it's 9.8mm
AF = 15.6mm
any ideas....
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DW100
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| posted on 12/12/14 at 09:10 AM |
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Give us a clue of age of the bolt. Or a picture of the end.
What is marked on it?
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r1_pete
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| posted on 12/12/14 at 09:11 AM |
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Sounds like 7/16 UNF, its too large dia for 3/8, if it were M11, the pitch would be 1mm 1.25mm 1.5mm depending on fine coarse etc....
[Edited on 12/12/14 by r1_pete]
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richardm6994
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| posted on 12/12/14 at 09:19 AM |
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JMW
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| posted on 12/12/14 at 09:27 AM |
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7/16th s UNF?
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DW100
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| posted on 12/12/14 at 09:30 AM |
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That's definitely and imperial bolt.
Metric bolts would have a grade mark like 8.8 or 10.9
I would say 7/16 UNF too
http://www.unionmillwright.com/2879.pdf
0.4375 x 25.4 = 11.1125mm
UNF would be 20 threads per inch
Here's a BSF chart too
http://www.motalia.com/Html/Charts/bsf_chart.html
[Edited on 12/12/14 by DW100]
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richardm6994
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| posted on 12/12/14 at 09:32 AM |
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Cheers guys 
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r1_pete
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| posted on 12/12/14 at 09:39 AM |
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Are you in a rush, I'm 99% sure I have a set of 7/16 unf taps, I deffo have 3/8 and 1/2, if you can wait so I can check later, you're
welcome to a loan, decent taps aren't cheap....
I'm at J31 M1....
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HowardB
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| posted on 12/12/14 at 10:04 AM |
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7/16 UNF is the size on seatbelt bolts I believe?
Howard
Fisher Fury was 2000 Zetec - now a 1600 (it Lives again and goes zoom)
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richardm6994
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| posted on 12/12/14 at 10:07 AM |
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Thank you for your kind offer R1-Pete. I've put a call into my dad this morning and he's certain he has one....but failing that I may take
you up on your offer
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