Technical Data:
Meet international standard API5B
Measure crest diameter of internal thread
Range: 4 1/2-20in / 114.3-508mm
Dial indicator stroke: 0.50in
Dial indicator graduation: 0.0005in
Accuracy: 0.002in
Measurement sequence: set left height, set right height, set zero, then measure
Select suitable length of arm according to workpieces where applicable

Dimensions:
L=12in, 18in or 24in
A1=177mm
A2=182mm
Reference dimension=27mm
Reference dimension=27mm
Reference dimension=15.875mm
Reference dimension=15.875mm

Optional:
Height standard and zero standard block A (without taper): 2237-G selectable code
Height standard and zero standard block B (with taper): 2237-K selectable code
Final standard-block order number is workpiece-specific and is not expanded without explicit selectable values