Pitch Diameter Gage Operation Manual
Models MRP 1500/2500/3500
Copyright © 2018 Gagemaker. All rights reserved
59
Rod Style Setting Standard Dimensions (continued)
Couplings
STC, LTC, EUE, and NUE Couplings (8 round thread)
A Standard (Diameter)
P.D. @ handtight plane - 2* (P.D. to crest) + shoe reposition factor - shoe
compensation factor
A = (E
1
- .06826) – (.500* .062) + .0002
B Standard (Shoe Location) Length to handtight plane + (.500 - 1/2 shoe length)
B = M + (.500 - .312)
Note:
The shoe reposition factor relocates the pivot shoe deeper into the box to clear the counter bore.
The shoe compensation factor compensates for the change in diameter of the pivot shoe
between the setting and measuring positions.
Buttress Couplings (3/4” TPF)
A Standard (Diameter)
P.D. @ handtight plane - 2* (P.D. to crest) - shoe compensation factor
A = (E
7
- .062) + .0002
B Standard (Shoe Location) Length to handtight plane – (1/2 shoe length)
B = (g – A) - .312
Note:
The shoe compensation factor compensates for the change in diameter of the pivot shoe between
the setting and measuring positions. Refer to Rod Style Setting Standards’ Correction Factor in
this manual.
Buttress Couplings (1” TPF)
A Standard (Diameter)
P.D. @ handtight plane - 2* (P.D. to crest) - total correction factor
A = (E
7
- .062) - .002
B Standard (Shoe Location) Length to handtight plane – (1/2 shoe pivot relocation)
B = (g – A) - .342
Note:
The total correction factor is necessary for a step type thread form. Step threads have roots and
crests parallel with the centerline of the pipe. The total correction factor compensates for both the
change in diameter of the pivot shoe between the setting and measuring positions and the
positioning of the shoe on the stab flank crest cone. Refer to Rod Style Setting Standards’
Correction Factor in this manual.