metric threads

[tracystrehl]

What do the letters "G" and "H" designate in regards to a metric thread? ex: M12x1.25-6H... Is this the same as "A" and "B" (male and female?). Thank you.

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[Bdrangdo]

It is a tolerance symbol

[deadlykitten]

M12x1.25-6H

hi, a bit late, but i just saw it : that is a "mother" thread; if you need factory infos about tread tolerances, iso profile deviations, tooling tolerances, etc, i can help / kindly