INSIZE 2237-20 Internal Thread Crest Diameter Measuring Instrument (4 1/2“-20”/144.3-508mm; 0.0005”)

Measure the crest diameter of internal thread with nominal diameter larger than 2 3/8” (60.325mm) and less than 20”(508mm)

Range(L): 4 1/2"-20”/144.3-508mm

Dial indicator stroke: 0.5”

Dial indicator graduation: 0.0005”

Accuracy: 0.002”

L: 12"; 18"; 24"

A1: 177mm

A2: 182mm

Optional accessory:

-Height standard and zero standard block