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Q:

How to specify metric thread with major diameter 45mm, 2mm pitch, grade 7, tolerance grade h (internal thread), right hand double start threaded profile?

A) M 45*2-7-H-RH-DOUBLE B) M 45*2-7-h-RH-DOUBLE
C) M 45*2-7-H-LH-DOUBLE D) M 45*7-2-H-RH-DOUBLE
 

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