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07-02-22, 08:47 PM
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#1 |
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IDing an American Thread
Anyone able to help me ID this bolt thread? It's from an American part.
I don't understand how their measuring system works  It nearly threads into an M4 nut then tightens up so it's very close.  
Last edited by DarrenSV650S; 07-02-22 at 09:05 PM. |
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07-02-22, 10:04 PM
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#2 |
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Re: IDing an American Thread
Most likely Whitworth 5/32" 32tpi
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08-02-22, 02:35 AM
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#3 |
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Join Date: Aug 2019
Posts: 56
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Re: IDing an American Thread
I guess we're looking at different rulers. I get 5/16" dia. x 16 threads per inch.
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65 CB160 (67-69), 69 350GTR (69-72), 72 R5, 73 RD350 (73-84), 82 XZ550 Vision (84-03), 01 Concours C10 (03-19), 89 EX250 (11-14), 00 SV650S (14-16), 03 SV650S (19-) |
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08-02-22, 08:26 AM
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#4 |
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Join Date: Jan 2019
Location: N W Leicestershire
Posts: 274
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Re: IDing an American Thread
5/16 x16tpi seems the American way and the thread pitch is different from metric.
Found this https://wooditfurniture.com/blogs/diy/m8-vs-5-16 but the article mentions M8? |
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08-02-22, 09:43 AM
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#5 |
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Re: IDing an American Thread
That's 5/32 dia, 32 tpi. Count the graduations between the 1 and the 2 inch marks, there are 32 of them.
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08-02-22, 10:33 AM
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#6 |
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Re: IDing an American Thread
yup 5/32 x 32tpi or #8 UNC
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08-02-22, 01:06 PM
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#7 |
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Member
Join Date: Jan 2019
Location: N W Leicestershire
Posts: 274
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Re: IDing an American Thread
I am missing the plot here! In the first inch the scale is in 1/16ths, there are 16 thread peaks - Have I unwittingly been under a misapprehension for 55 years. Would someone explain in more detail. Thanks
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08-02-22, 02:22 PM
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#8 | |
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Re: IDing an American Thread
Quote:
The thread that is showing only just goes past the 1/2 inch mark, the small divisions are 1/32 not 1/16. The large "1" on the top of the rule is the 1 inch mark - I suspect you confused the 1/2 inch mark for the 1 inch mark.
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08-02-22, 02:28 PM
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#9 | |
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Member
Join Date: Aug 2019
Posts: 56
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Re: IDing an American Thread
Quote:
__________________
65 CB160 (67-69), 69 350GTR (69-72), 72 R5, 73 RD350 (73-84), 82 XZ550 Vision (84-03), 01 Concours C10 (03-19), 89 EX250 (11-14), 00 SV650S (14-16), 03 SV650S (19-) |
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08-02-22, 04:55 PM
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#10 | |
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Member
Join Date: Jan 2019
Location: N W Leicestershire
Posts: 274
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Re: IDing an American Thread
Quote:
Cripes senility fast approaches. Thank you Seeker as soon as I had another look it was so obvious. Mind you I had just drank a pint of beer that was pretty good - think I will have another one  and then take another look.What a plonker I am Last edited by redtrummy; 08-02-22 at 04:56 PM. |
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