Hi folks,
Could someone please tell me the thread type on the front fork top bolt (the one that screws into the fork tube) ? It seems to be 3/4" in diameter and 20 tpi not 26 tpi, but is it still BSC ?
Cheers,
Bevan
Front fork top bolt thread
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bevanclark
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Roger Gwynn
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Re: Front fork top bolt thread
With very few exceptions all threads are either CEI or Whitworth. The others are BA and the occasional BSF on four strokes, the 2/ are mainly UNF and UNC.
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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Roger Gwynn
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Re: Front fork top bolt thread
Cycle thread is unusual in that the tpi is not fixed for any size, although most are 26 up to 7/16. 20,26,30 are also used, BSA used both 20 and 26 tpi at 1/2" diameter another reason to avoid them.
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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