The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: TassieChris on 31.05. 2016 09:15
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Hi Guys
I'm hoping someone can help me identify the size of the thread shown on the pictures below.
The nut is stripped so I need to buy another but I'm not sure of the size.
Pretty sure its 3/8 (measures .37 inches on my vernier) and the closest thread gauge I have makes it about 27 TPI (probably 26 TPI but I don't have a 26 TPI gauge).
The closest thread I can find is a 3/8 cycle engineers thread which is 26 TPI with a 60 degree angle or there is also a brass pipe screw thread which is also 26 tpi but with a 55 Degree angle on the thread.
My guess is its a cycle engineers thread but I was hoping someone could verify that for me.
Thanks
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Shaft and idler on Ebay - £40 ish with postage (looks in good nick might even be someone here)
enter in the search box - BSA A7 A10 CAMSHAFT DRIVE IDLER PINION & SHAFT - and it should take your there.
However I'm sure it's cycle
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its too cold to go outside, so parts book says for all A group dynamo driving sprocket nut = 2-449 and according to someones spreadsheet of bolts its:
02-0449 NUT CEI 3/8"-26 THIN HEIGHT
so you were right!
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Thanks Guys - that helps a lot.
My shaft is actually fine its just the nut that's stripped so hopefully now I know what it is my local "nuts and bolts" shop should have one.
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G'day Chris.
Go to the local pushbike shop and get a 3/8" axle nut. that's whats holding mine on.
Cheers