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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"
I can't answer your question but Cycle thread is 26tpi at 5/16" diameter....Ian
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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
I'll have a look later this week and run my Tap through to clean them up.
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
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
Yes I agree, I put my 5/16 BSCY tap through them today and cleaned up the threads.