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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" Cheers Al
I can't answer your question but Cycle thread is 26tpi at 5/16" diameter....Ian
email (option): ian@wright52.plus.com
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
Thanks Chris I'll have a look later this week and run my Tap through to clean them up. Cheers Al
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
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
Bruce Yes I agree, I put my 5/16 BSCY tap through them today and cleaned up the threads. Thanks Al