Technical Data:
Meet international standard API5B
Measure height of internal thread with nominal diameter less than 5 1/2in (139.7mm)
Range: 0-1/4in
Dial indicator graduation: 0.0005in
Accuracy: 0.02mm / 0.0008in

Dimensions:
Body diameter=dia.40mm
Reference length=300mm
Included/reference angle=<50deg

Optional:
Thread height standard blocks: 6250 series