Go figure, a 1947 Hawthorne uses a 3/8" BSF thread for the handlebar clamp bolt. No wonder hardware store stuff doesn't fit. It is 20 threads per inch where American is either 24 or 16. Anyone know where I can find a couple? They have 1/2" hex head and the threads are 7/8" in length. Brits call them set screws because they are threaded all the way up versus having a smooth shank portion below the hex head, lingo I guess.
British Standard Fine bolt 3/8"
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I kinda doubt it is Bitish thread, why would a USA made bike, Hawthorne have British threads, the threads are probly messed up, need to take a tap and clean them in the stem, and use a new bolt, how I know this? I have many Hawthorne and Rollfast bikes, and all are American threads
olschbp said:
righto old bean.
i'm not saying you're right or wrong regarding this particular example, but it wouldn't surprise me at all......check your BB/headset (english), your plumbing (british standard pipe), your language (english). there was a time in recent history, when britain was the worlds greatest empire.....and some things stuck :mrgreen:
Hey there hubby, those British pipe threads were one thing that didn't stick. :wink: I cut miles of pipe thead during my machinist days, including all the British favorites...BSPT (taper), BSPP (parallel) and my favorite, BSW (Whitworth). Smooth as a babys butt. I worked for IMI, a British Co. However, we use NPT here in the states...national pipe thread. Gary
Believe it or not the threads are easy to measure. You simply lay them by a ruler and count the threads per inch. Seriously it is that easy. My bolt is less than an inch so I counted 5 threads in 1/4". 4 x 5 = 20. It is not a replacement gooseneck. Both my '47 Hawthornes use the same bolt and they came from different owners when I bought them. Strange but true.
B607 said:
that's me told.
but your country's a special case in terms of not conforming to international standards.in that respect, you're a bit like the french :lol: :wink:
Hello hubgearfreak,
We were ISO 9001 certified. You know ISO? The valves we shipped to GB had British threads, Germany had DIN, valves we shipped to NASA for use on the Space Shuttle and to the US Navy for nuclear subs had American thread. Our valves conformed to the standards of the country of the customer.
Speaking of International Standards, does Britain still use "stones" to measure weight? :wink: How many stones do you weigh hubby? Ten or eleven stones? Another of those "special cases", hmmmm?
Since tapered pipe thread was invented in the US and standardized during the Civil War (1862) in Philadelphia by Robert Briggs of the Pascal Iron Works, it seems to me the rest of the world should conform to our thread standards, and not the other way around. 8) Regards, Gary
We were ISO 9001 certified. You know ISO? The valves we shipped to GB had British threads, Germany had DIN, valves we shipped to NASA for use on the Space Shuttle and to the US Navy for nuclear subs had American thread. Our valves conformed to the standards of the country of the customer.
Speaking of International Standards, does Britain still use "stones" to measure weight? :wink: How many stones do you weigh hubby? Ten or eleven stones? Another of those "special cases", hmmmm?
Since tapered pipe thread was invented in the US and standardized during the Civil War (1862) in Philadelphia by Robert Briggs of the Pascal Iron Works, it seems to me the rest of the world should conform to our thread standards, and not the other way around. 8) Regards, Gary
hey sorry, i was only meaning to be light-hearted.
i don't know my weight in stones, but i'm 86kgs
i don't know my weight in stones, but i'm 86kgs
if it is 3/8 british, which I doubt, as the british dont use inch measurements, you wouldn't be able to get a American 1/2" wrench on it, as I have withworth, bss tools since I used to work on Britts motorcycles, but what do I know, probly nothing, any good mechanic or machinest would just retap it and be done with it
