Author Topic: UNF Threads on frame and cycle parts on A10 Rocket  (Read 660 times)

Offline KeithJ

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Appreciate some input from those with a font of knowledge.  I know some heads are A/F sizes but I am being told some UNF threads have been originally used.  I don't think this is so.  Am I wrong?
'59 A10RR + Second engine

Offline Jules

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Re: UNF Threads on frame and cycle parts on A10 Rocket
« Reply #1 on: 11.04. 2013 08:41 »
Hi Keith, my experience has been either Whitworth or cycle threads (which are typically whitworth head sizes anyway), but with a few BA's thrown in for good measure!
I know the guys on the forum can be much more specific about whats used where though, but I dont think (early) British bikes ever used UNF at all.........

Online Billybream

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Re: UNF Threads on frame and cycle parts on A10 Rocket
« Reply #2 on: 11.04. 2013 09:18 »
Hi Keith.
UNF and UNC are imperial threads, and were common in the engineering industry upto the change to metrication, I was brought up with these threads in the 60s, can confirm they are not used on BSA,s as they left the factory. That,s not to say some of your bike has been modified using these thread,s by previous owners.
1960 Super Rocket, owned since 1966, back on the road 2012 after being laid up for 29yrs.

Offline KeithJ

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Re: UNF Threads on frame and cycle parts on A10 Rocket
« Reply #3 on: 11.04. 2013 09:51 »
Thanks for the replies which confirm my understanding. 
ATB
'59 A10RR + Second engine

Offline muskrat

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Re: UNF Threads on frame and cycle parts on A10 Rocket
« Reply #4 on: 11.04. 2013 10:53 »
The later A50/65's are a minefield of threads. UNF & UNC as well as some cycle and whitworth.
Cycle, Whitworth and BA on A7/10's.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
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Online trevinoz

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Re: UNF Threads on frame and cycle parts on A10 Rocket
« Reply #5 on: 11.04. 2013 22:55 »
And we won't mention some of the threads that Amal & Lucas used!

Trev.

Online KiwiGF

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Re: UNF Threads on frame and cycle parts on A10 Rocket
« Reply #6 on: 12.04. 2013 05:46 »
You might find some "period" aftermarket parts like pillion footrests or silencers etc are UNF/UNC.....
New Zealand

1956 A10 Golden Flash (1st finished project)

1949 B31 rigid “400cc hot rod” (2nd finished project, + favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, project missing parts, mission impossible?

GL1800 Goldwing, well, the wife likes it

KTM 950 ADV, cos it’s 100% nuts

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