|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
03-02-2018, 02:20 PM | #1 |
Senior Member
Join Date: Jul 2010
Location: Belgistan (formerly known as Belgium)
Posts: 573
|
USA bolt sizes - Withworth - Metric
Can anyone provide me a list with most current US bolt sizes and the TPI ? or a good link on the space wide web.
And is there a difference TPI between these and the Whitworth ? (Both Imperial ?) I can use some explanation on this. (Metric is no problem) |
03-02-2018, 02:32 PM | #2 |
Senior Member
Join Date: Aug 2010
Location: Port Orchard, WA
Posts: 1,498
|
Re: USA bolt sizes - Withworth - Metric
Link to Whitworth table
http://motalia.com/Html/Charts/bsw_chart.html Link to ASE table https://sizes.com/tools/thread_american.htm
__________________
1931 160B & 1931 68B If you don't have time to do it right the 1st time, how do you have time to do it the 2nd time? |
Sponsored Links (Register now to hide all advertisements) |
|
03-02-2018, 02:37 PM | #3 |
Senior Member
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,443
|
Re: USA bolt sizes - Withworth - Metric
This web site is brilliant for enthralling enthusing and explaining about threads... http://www.ac2litre.com/fasteners.html ... a delight one for those who find the minutiae of detail and life so fascinating
|
03-02-2018, 02:57 PM | #4 |
Senior Member
Join Date: Aug 2017
Location: Fruita, CO
Posts: 281
|
Re: USA bolt sizes - Withworth - Metric
The main difference between the British Whitworth and the Unified Screw Threads in the thread angle, 55 degrees and 60 degrees for the Unified (and metric as well). The threads per inch as similar between the Unified and the Whitworth, and with a long enough cheater bar they might be forced together. My Machinery's Handbook, 17th edition (1966), has well over one hundred pages covering screws and threads. 3 pages dedicated to the Whitworth. Spending 6 decades under an auto hood and over 5 decades in the tool & die business, I have never seen a Whitworth thread.
|
03-02-2018, 03:49 PM | #5 |
Senior Member
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,443
|
Re: USA bolt sizes - Withworth - Metric
How fortunate you are Slammin!! Over here working on prewar Austins, MGs ,Model A Fords and post war MGBs I never know what thread is going to appear!!!... and the MGs are the worst .. prewar a mix of metric, BSF, Whit with different hex heads, and the MGBs shifting from UNF/UNC to Metric halfway through their production.
|
03-02-2018, 04:12 PM | #6 |
Member
Join Date: Jul 2012
Location: Epping,New Hampshire
Posts: 89
|
Re: USA bolt sizes - Withworth - Metric
Sponsored Links (Register now to hide all advertisements)
|
03-02-2018, 04:25 PM | #7 |
Senior Member
Join Date: May 2010
Posts: 2,597
|
Re: USA bolt sizes - Withworth - Metric
Then in 60's and 70's there were the Yamaha dirt bikes (RT-1, DT-1,CT-1 and etc) with ISO threads on SOME parts with metric on the rest of the scooter. Shock mounts and SOME front fork fasteners were ISO as I remember. Same same on SOME internal engine and transmission parts.
Last edited by Benson; 03-03-2018 at 05:11 PM. |
03-02-2018, 04:40 PM | #8 |
Senior Member
Join Date: May 2010
Location: Durango CO
Posts: 1,309
|
Re: USA bolt sizes - Withworth - Metric
Back in the late fifties, I worked in the Sears tool department. We always knew who was working on a Jag as that person would buy Standard, Metric AND Whitworth tools.
__________________
No restorable Model A's were harmed in the building of this truck! |
03-02-2018, 04:44 PM | #9 |
Senior Member
Join Date: May 2010
Location: Bismarck ND
Posts: 1,189
|
Re: USA bolt sizes - Withworth - Metric
If I remember the Triamph motor cycles had the whithworth thread. It is hard to find those fasteners in our area.
|
03-02-2018, 04:59 PM | #10 |
Senior Member
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,496
|
Re: USA bolt sizes - Withworth - Metric
It doesn't stop at just the difference between SAE and Whitworth for imperial sizes. From 1/4" up to 1/2", SAE and Whit have the same TPI, only a different thread form (55 or 60 degrees). A nut from one can be put on the other but won't fit or perform at its best. At 1/2", Whit is 12 tpi and SAE, 13. Why is anybody's guess. For anything smaller than 1/4", there is no whitworth thread. Joseph Whitworth, the designer made none smaller than 1/4". Others have added bastard threads since and called them Whitworth but the intention was that for smaller than 1/4", the BA (British Association) system would be used. I think that is similar to the American system where they use 4,6 or 8 (for example) gauge screws (which are a mystery to me). I wonder if there is any correlation between those and BA
UNF is the fine thread version of SAE (UNC) and BSF, the British fine thread system (British Standard Fine). As for the different sizes of the hex nuts and bolt heads, the Americans quote a simple measurement across the flats (AF) whereas, there is a formula in Whitworth to calculate the size of the hex and it is based on the diameter of he thread. Then there is Metric! Oh so easy. I am nearly finished restoring a French car from 1928 and all of the threads are standard metric. That makes things sooooo easy. IMO, the best thing to have happened in the world of engineering is the (almost) universal adoption of the metric system. As far as I know, only one country in the world persists with the antiquated imperial weights and measures system and even then, it is not the imperial system that the rest of the world used to use. A real oddball!
__________________
I'm part of the only ever generation with an analogue childhood and a digital adulthood. Last edited by Synchro909; 03-02-2018 at 07:16 PM. |
03-02-2018, 06:14 PM | #11 |
Senior Member
Join Date: Dec 2010
Location: Hingham, MA
Posts: 135
|
Re: USA bolt sizes - Withworth - Metric
Whitworth on my old Norton 750.
|
03-02-2018, 07:28 PM | #12 |
Senior Member
Join Date: Jul 2010
Location: Cow Hampshire
Posts: 4,188
|
Re: USA bolt sizes - Withworth - Metric
Just about ANY thread of common use, past & present, is shown on the compilation at http://webcache.googleusercontent.co...com/thread.xls
The table starts out a little slow - all those small sizes like camera and precision instrument threads. But scan down a few pages and find BSW, ASME, NC, Metric and just about anything you might want. All arranged in order of increasing size. A forgotten thought is that machine screws - shown on the table as "ASME" sizes - and which can be found at most hardware stores beginning with a No. 2 (possibly) and ended with No. 12 (possibly) but the number system goes on beyond No. 12, all the way up to No. 30 (0.450 basic diameter.) I owned a lathe made in 1874 which used No. 28 screws in the headstock bearings. Joe K
__________________
Shudda kept the horse. |
03-02-2018, 11:05 PM | #13 |
Senior Member
Join Date: Oct 2017
Posts: 563
|
Re: USA bolt sizes - Withworth - Metric
That's the nice thing about standards, there are so many to choose from.
|
03-02-2018, 11:20 PM | #14 | |
Senior Member
Join Date: Oct 2017
Posts: 563
|
Re: USA bolt sizes - Withworth - Metric
Quote:
Interestingly spark plugs have been Metric for almost as long as they've been around iirc. There were some other early Ford parts - maybe in the differential? That have always been metric. In a (sort of) similar vein, iirc American firearm ammunition cartridges were/are Berdan primed - a European invention, while European ammunition cartridges are all Boxer primed, an American invention. Hm. |
|
03-02-2018, 11:56 PM | #15 |
Senior Member
Join Date: Jul 2010
Location: Belgistan (formerly known as Belgium)
Posts: 573
|
Re: USA bolt sizes - Withworth - Metric
Thanks for all the usefull links and comments so far !
|
03-03-2018, 04:11 AM | #16 |
Senior Member
Join Date: Jul 2010
Location: Auckland, New Zealand
Posts: 515
|
Re: USA bolt sizes - Withworth - Metric
If you own an older British motorcycle many of the threads were BSC British cycle engineering also called CEI threads ( cycle engineering institute). 1/4 inch and above were all 60 degree 26 tpi. That is close to 1 mm pitch (25.4 inch)so a certain metric size screws on with a class B fit from memory. Heads are smaller than Whitworth. Are they SAE A/F sized heads? I will have to go to my workshop and see.
7/16 and 1/2 inch were sometimes optionally 20 tpi, still at 60 degrees. SAJ in NZ |
03-03-2018, 04:43 AM | #17 |
Senior Member
Join Date: May 2010
Location: Victoria, Australia
Posts: 1,177
|
Re: USA bolt sizes - Withworth - Metric
I noticed that no one has mentioned UNEF, which is used on some fasteners in aviation. I've worked on British, American and Italian aircraft, so I have been exposed to three different thread standards. I have also worked on American, British, European, Japanese, Australian cars and bikes, so have also been exposed to different thread standards there as well. This means my toolbox has many odd ball spanners. All this just adds to the fun of spinning spanners.
|
03-03-2018, 08:02 AM | #18 |
Senior Member
Join Date: May 2010
Location: New Jersey
Posts: 734
|
Re: USA bolt sizes - Withworth - Metric
If I could only tell what to "expect" when I try to take something apart. Is it this or is it that. Then the real fun starts when this is this and that is that, SAE here, metric there.
|
03-03-2018, 08:32 AM | #19 | |
Senior Member
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,443
|
Re: USA bolt sizes - Withworth - Metric
Quote:
|
|
03-03-2018, 09:46 AM | #20 | |
Senior Member
Join Date: May 2010
Location: Bucks Co, Pa
Posts: 3,740
|
Re: USA bolt sizes - Withworth - Metric
Same here!
Quote:
|
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|