Tri-Roll Thread Gage 1/8″-NPTF OD Comparator C3-101

1/8″ NPTF Tri-Roll Thread Comparator

Outiside Diameter 

Features –

• Frame: C3
• Gauging Points: 1-8″ – NPTF
• Stand: 101
• Indicator: Johnson Dial .0025″ *Note: Lens is loose
• Gauging rolls are interchangeable
• Indicator Repeats Nicely, Lens Cover Has Fallen Off but is Included

NPTF (National Pipe Taper Fuel) threads have the same taper of 3/4″ per foot, and 60º thread angle as NPT. However, they do differ significantly in the crest and root truncation requirements. Tolerance limits are tigter for proper “dryseal” assembly.

The lens cover is loose and is included because it is original. 

Well maintained. 

Made in USA