AWGB Woodturning Forum
General Category => Tool tips & reviews => Topic started by: BobG on May 06, 2017, 04:55:49 PM
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Is the thread on a Graduate 1 1/2 x6tpi a Whitworth or UNC thread form?
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Whitworth form that's 55 degrees
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Cheers, looked like Whitworth but I couldn't find my thread gauges! Now I need to find a tap at a sensible price...