Spi 34-453-1 Threaded Pipe Ring 2-11/2 Npt L1 Tool Steel

Product Description

The SPI 34-453-1 is a Class L1 threaded pipe ring gauge manufactured from tool steel, designed for inspecting and verifying external NPT pipe threads. The gauge conforms to a 2-11/2 threads-per-inch NPT thread form and is used to check thread form, pitch, and fit on male-threaded pipe ends. Supplied with NIST traceability certification, this ring gauge is appropriate for quality control environments where documented measurement standards are required. It is used by machinists, pipefitters, QC inspectors, and metrology technicians working in manufacturing, fabrication, and industrial piping applications.

This gauge is suited for use in shops and facilities that produce or inspect NPT-threaded pipe fittings, valves, and pipe sections. The Class L1 designation indicates the gauge is used to check the hand-tight engagement length of the thread, which is the standard production inspection requirement for NPT pipe thread gauging. It is applicable in both light industrial and heavy industrial settings where pipe thread quality must be verified to industry standards.

Key Features

• Class L1 designation for standard NPT hand-tight engagement inspection
• 2-11/2 NPT thread size for use on corresponding male pipe threads
• Tool steel construction for durability and dimensional stability
• NIST traceability certification included for quality documentation requirements
• Individual unit packaging suitable for tool crib and bench use

Compatibility

Designed for inspecting male NPT pipe threads at the 2-11/2 size, conforming to Class L1 gauging requirements per standard NPT thread gauging practice.

Installation Notes

This is a precision inspection gauge, not a production pipe fitting. Handle with care to avoid damage to the thread form. Store in a protective case when not in use to maintain calibration integrity. Gauges should be periodically re-calibrated against a NIST-traceable master to confirm continued accuracy.