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BB thread ID... help

Old 04-30-12, 01:35 PM
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seablister
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BB thread ID... help

Going through my old bike stuff, I ran across an unused vintage Campy bottom bracket and am trying to id the thread type. On the end pieces, this is stamped... "36x24F Whit". Does the 36x24 suggest Italian? Does the Whit suggest Whitworth? Help please.

This is the mating BB to an unused vintage Campy crank... both needing a new home.

Appreciate your help.

Jim
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Old 04-30-12, 01:38 PM
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well biked 
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Yes, it is Italian threaded.
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Old 04-30-12, 01:43 PM
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Could be.. thread is a bit different, in detail,
rounded tip vs a squared off tooth tip for the thread cutting die.

You might have the Pro Shop with an Italian BB Tap set, face and chase the frame's BB thread.


but it sounds like you are adding data to help sell the parts.
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Old 04-30-12, 01:54 PM
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Yep, it's Italian. The 36x24F means 36 mm cup diameter x 24 threads/inch and I believe the F stands for "fine" as that thread pitch is much finer than normal for the diameter.

Italian and Whitworth threads have an apex angle of 55° where "English" (aka Imperial or SAE) threads have a 60° apex angle so that's why the Whit(worth) is there.
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Old 04-30-12, 07:13 PM
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seablister
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Thank you for the clarification.
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