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Submitted by terence_terrell on Fri, 27/09/2013
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Good Morning to All

I am sure someone can enlighten me on the system for bolt thread size used on my 1949 ES2. My set of Whitworth tools fit OK but the threads remain a mystery.

Terence (Enthusiastic Novice)

Submitted by terence_terrell on Fri, 27/09/2013

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Previously Chris Grimmett wrote:

There are other more comrehensive sources on the web, but the technical pages of this site have a basic

guide to screw threads.

Many thanks Chris I'll just enroll in the Open University before I try to fathom that list.

Regards Terence

Submitted by gordon_johnston on Fri, 27/09/2013

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OK, almost all nuts and bolts are cycle threaded, 26 tpi. Studs going into alloy are invariably whitworth threads - coarse, and varies with the stud diameter. All these nuts and bolts takeWhitworth spanners. Hope that helps. Gordon.

Submitted by paul_knapp on Sat, 28/09/2013

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Just be a bit cautious Terence, there are a couple of nuts that are metric (speedometer) and generally any electrical parts are B.A., also I think somecontrol leverscould also beB.A.? Some internal rotating engine/gearboxnuts are 20TPI.

If when screwing some part together, and there is a tightness AND the thread is clean and appears to be not damaged, don't force it, check the parts for compatability. I have dismantled too many parts to find the thread damaged by incompatable thread pitch, or damaged threads being forced together by 'Sat'dy arvoback yarders'.

Best you get yourself a set of combination thread gauges (metric/imperial) and a vernier caliper to keep in your tool box so as to ensure you have no dramas when playing around any of these old Brit bikes. It's all good fun with the correct tools!wink

Paul

Submitted by simon_amos on Sat, 28/09/2013

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Previously Paul Knapp wrote:

Just be a bit cautious Terence, there are a couple of nuts that are metric (speedometer) and generally any electrical parts are B.A., also I think somecontrol leverscould also beB.A.? Some internal rotating engine/gearboxnuts are 20TPI.

If when screwing some part together, and there is a tightness AND the thread is clean and appears to be not damaged, don't force it, check the parts for compatability. I have dismantled too many parts to find the thread damaged by incompatable thread pitch, or damaged threads being forced together by 'Sat'dy arvoback yarders'.

Best you get yourself a set of combination thread gauges (metric/imperial) and a vernier caliper to keep in your tool box so as to ensure you have no dramas when playing around any of these old Brit bikes. It's all good fun with the correct tools!wink

Paul

Good advice, a would also recommend a set of taps and dies, with caution and care these are invaluable for cleaning and tidying up threaded castings in the frame.

Regards Darren

Submitted by terence_terrell on Sat, 28/09/2013

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Many Thanks to you all for the valuable advice.I can now get to work without fear and trepidation.

Best Regards Terence

 


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