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Taps

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cougfan

cougfan

Aerospace
Joined
Oct 14, 2004
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31
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US
What does the "GH" designate when picking taps (GH3,..,GH7. I know that GH7 cuts a bigger thread than GH3, but I am curious about what GH stands for.
 
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"G” designates Ground Thread. “H” means that pitch diameter is on the high side of basic. These two letters are followed by a numeral showing the tolerance of pitch diameter oversize.

Hope that helps.
 
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