Vermont Gage 441110010 Pipe Ring Gage 1-11-1/2 Npt L1

Product Description

The VERMONT GAGE 441110010 is a Class L1 threaded pipe ring gage machined from tool steel and sized for 1-11-1/2 NPT thread form. Ring gages of this type are used to verify the external taper threads on pipe fittings, nipples, valves, and similar threaded components. The L1 classification establishes the tolerance range for go-type inspection, confirming that a male NPT thread falls within the acceptable engagement zone. A NIST traceability certification is included with each unit, supporting documented calibration records required in quality-controlled shop and field environments.

This gage is suited for inspection applications in plumbing, pipefitting, and industrial manufacturing where NPT thread conformance must be verified before assembly. It is appropriate for both production-floor inspection and incoming-material verification. The 1-inch nominal pipe size with 11-1/2 threads per inch is a standard taper thread used widely in pressure piping, gas distribution, and hydraulic system fittings. Calibration and metrology professionals, quality technicians, and journeyman pipefitters working under documented quality systems will find this gage a direct-fit inspection tool.

Key Features

• Class L1 tolerance classification for go-type external NPT thread inspection
• Tool steel construction for wear resistance and dimensional stability under repeated use
• 1-11-1/2 NPT thread size covers a standard nominal 1-inch pipe thread
• NIST traceability certification included for compliance with documented calibration programs
• Compact unit weight supports easy handling during inspection routines

Compatibility

Designed for go-type inspection of external 1-11-1/2 NPT taper threads on pipe, fittings, and threaded components conforming to the NPT standard.

Installation Notes

Thread ring gages are precision inspection instruments and are not installation components. Handle with clean, dry hands or lint-free gloves to prevent corrosion and dimensional contamination. Store in a protective case away from impact, abrasive surfaces, and temperature extremes. Calibration intervals should be established per your quality management system; return the gage to a certified metrology lab when wear or out-of-tolerance conditions are suspected.