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1941 WD G3L Fork Slider Thread Question

I am just double checking as I am progressing. What is the thread for the holes at the top for securing the front mudguard to the slider?

I know the threads at the bottom of the sliders for the studs that secure the axle are 5/16 22TPI.

I am assuming the top ones are 5/16 24TPI (BSCY)?

Can someone confirm please"





Cheers

Al

Re: 1941 WD G3L Fork Slider Thread Question

I can't answer your question but Cycle thread is 26tpi at 5/16" diameter....Ian

email (option): ian@wright52.plus.com

Re: 1941 WD G3L Fork Slider Thread Question

Hello Alum

Re. Fork slider oil level screw.

The thread is 1/4 C.E.I. (Cycle engineers thread) at 26 threads per inch. Old part No STD. 485. New part number 00 0486

This screw has a 1/4 I/d. Fibre washer under the head as a seal. Old part No. 302. New part No. 00 0203

Hope this helps you

Chris Moore

Re: 1941 WD G3L Fork Slider Thread Question

Thanks Chris

I'll have a look later this week and run my Tap through to clean them up.

Cheers

Al

Re: 1941 WD G3L Fork Slider Thread Question

Chris

Wrong part, you were looking at the "Scew, plug, oil drain, for fork slider, 1/4" by 1/4" by 27"

I was referring to the two threaded holes above that, that are used to secure the front mudguard to the fork slider.

They look to be 5/16 bscy

Cheers

Al

Re: 1941 WD G3L Fork Slider Thread Question

I don't have a 1941 Matchless but do have a 1951 Matchless. Assuming the threads are the same it should be 5/16" x 26 BSC.

You mentioned 5/16" x 24 but that would be a UNF thread.

To be safe as I don't know if 1941 and 1951 use the same fork threads, for reference.

British threads for 5/16" are:

18 TPI is BSW

22 TPI is BSF

26 TPI is BSC

Re: 1941 WD G3L Fork Slider Thread Question

Bruce

Yes I agree, I put my 5/16 BSCY tap through them today and cleaned up the threads.

Thanks

Al

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