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Author Topic: What Threads?  (Read 1222 times)

Offline Stu55Flash

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What Threads?
« on: 09.02. 2010 20:58 »
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!

Offline Desburnett

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Re: What Threads?
« Reply #1 on: 09.02. 2010 21:06 »
Original cycle parts were indeed BSC 26tpi. Tappings in the aluminium are Whitworth.

Des
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Offline Josh Cox

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Re: What Threads?
« Reply #2 on: 09.02. 2010 21:16 »
Head bolts usually BSF.
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Offline trevinoz

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Re: What Threads?
« Reply #3 on: 09.02. 2010 21:59 »
Usually 7/16" and over are 20 TPI which is a cycle thread also.
Trev.
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Offline BSA_54A10

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Re: What Threads?
« Reply #4 on: 10.02. 2010 10:39 »
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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Offline Josh Cox

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Re: What Threads?
« Reply #5 on: 10.02. 2010 10:44 »
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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