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H  = 0.86603P
h3  = 0.61343P 
H1 = 0.54127P
r    =  = 0.14434P
         6  
d2  = d - 0.64953P (Effective-Pitch-Diameter)
D1 = d - 2H1 (Minor Diameter - Internal)
d3  = d - 2h3 (Minor Diameter - External)
D  = (Major Diameter)

NOTE: Above limits are based on DIN 13 Sheet 13 for medium tolerance class. For external threads: For internal threads:
M1 - Tolerance 6h 
M1.6 and up - Tolerance 6g
M1 - Tolerance 5H
M1.6 and up - Tolerance 6H

 T24