Spi 34-445-7 Threaded Pipe Ring 1/8-27 Npt L1

Product Description

The SPI 34-445-7 is a Class L1 threaded pipe ring gauge manufactured from tool steel and used to verify external NPT pipe threads. It checks that a machined or cut 1/8-27 NPT male thread falls within the L1 tolerance class, confirming proper taper, pitch, and thread form before assembly. The L1 classification indicates a single-pass go gauge, the standard acceptance tool for NPT threaded pipe and fittings in production and inspection environments. A NIST traceability certification is included with each unit, supporting quality documentation requirements. Machinists, pipe fabricators, quality control inspectors, and plumbing professionals use this gauge to confirm thread compliance on finished workpieces.

This threaded pipe ring gauge is suited for use in precision manufacturing, pipe fabrication shops, and field inspection applications wherever 1/8-27 NPT threaded connections must meet dimensional standards. It is applicable to pipe nipples, fittings, valves, and other components carrying an external 1/8-27 NPT thread. The included NIST traceability certification makes it appropriate for regulated environments where documented measurement traceability is required, including quality management systems operating under ISO or similar standards.

Key Features

• Class L1 tolerance classification for standard NPT go-gauge acceptance inspection
• 1/8-27 NPT thread size covers common small-bore pipe and fitting connections
• Tool steel construction provides wear resistance for repeated production use
• NIST traceability certification included for quality documentation and compliance
• Single-unit packaging with a minimum order quantity of one

Compatibility

Designed for inspection of external 1/8-27 NPT threaded components including pipe nipples, fittings, and threaded valves conforming to NPT taper thread standards.

Installation Notes

Thread ring gauges are precision inspection tools and should be handled by trained metrology personnel or qualified machinists. Store the gauge in its case when not in use to protect the thread form from damage. Do not force the gauge onto a workpiece thread; excessive torque can damage the gauge or produce false readings. Periodically verify gauge condition against a setting plug or send for recalibration per your facility quality program.