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The BSA A7 & A10 Forum > Technical > A7 & A10 Engine > What Threads?
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Author Topic: What Threads?  (Read 456 times)
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Stu55Flash
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« on: 09.02. 2010 21:58 »
What threads should the cycle parts be? Are they all 26tpi BSCy. I have different ones but this is only to be expected on a bike this age. I have alot of Whiteworth threads.

Thanks

Stuart
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"Keep a distance from lady "L" drivers in cars. Some are not mechanically minded, are slow to acquire road sense, an are apt to panic..." The Pitman Book of the BSA Twins.
Golden Flash Plunger 1955, Francis Barnett Falcon 67 1954, Ferguson TEA Tractor 1951. Looking for another project!
Desburnett
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« Reply #1 on: 09.02. 2010 22:06 »
Original cycle parts were indeed BSC 26tpi. Tappings in the aluminium are Whitworth.

Des
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Josh Cox
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« Reply #2 on: 09.02. 2010 22:16 »
Head bolts usually BSF.
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Black 1953 Golden Flash Plunger
trevinoz
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« Reply #3 on: 09.02. 2010 22:59 »
Usually 7/16" and over are 20 TPI which is a cycle thread also.
Trev.
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BSA_54A10
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« Reply #4 on: 10.02. 2010 11:39 »
look up <http://stainlessbits.com/link12.html> on the web.
There is a complete listing of all BSA / Triumph threads by part number.
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Bike Beesa
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Josh Cox
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« Reply #5 on: 10.02. 2010 11:44 »
Be very carefull with the listing, it is extremely helpful, but I have found one listed thread in that to be wrong, the tank badge screw was listed as a BA thread, when it was a BSW.

Lsited as 5BA when it was infact 1/8 BSW
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Black 1953 Golden Flash Plunger
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