Technical Data:
Meet international standard API5B
Measure pitch of internal thread with nominal diameter larger than 1 1/2in (38.1mm) and less than 5 1/2in (139.7mm)
Range (L): 0.5-4in / 12.7-101.6mm
Dial indicator graduation: 0.0005in
Dial indicator stroke: 0.025in
Accuracy: 0.02mm / 0.0008in
Measurement principle: set zero on standard block, then measure workpiece

Dimensions:
Reference diameter=dia.35mm
Reference length=135mm
Ball/contact reference diameter=dia.1.448mm

Optional:
Ball points: 6252 series
Standard pitch blocks: 6251 series