Spi 34-444-0 Threaded Pipe Ring 1/16-27 Npt L1

Product Description

The SPI 34-444-0 is a Class L1 threaded pipe ring gauge manufactured from tool steel and conforming to NPT (National Pipe Taper) thread standards. Pipe ring gauges are precision inspection tools used to verify the dimensional accuracy of external tapered pipe threads. This gauge is sized for 1/16-27 NPT threads, meaning it checks threads with a 1/16-inch nominal pipe size at 27 threads per inch. The Class L1 designation indicates a tolerance class appropriate for standard production inspection. A NIST traceability certification is included, making it suitable for calibrated measurement environments where documented traceability is required by quality systems or customer specifications.

This gauge is used in manufacturing, machining, and mechanical service environments where NPT-threaded fittings, nipples, or pipe ends must be inspected for conformance before assembly or shipment. Typical users include machinists, quality control inspectors, tool-and-die shops, and pipefitters verifying threaded component production. The 1/16-27 NPT size applies to small-diameter pipe connections common in instrumentation, pneumatic fittings, and precision fluid systems.

Key Features

• Class L1 tolerance classification for standard production thread inspection
• NPT (National Pipe Taper) thread form for tapered external thread verification
• Thread size: 1/16-27 NPT (1/16-inch nominal pipe size, 27 threads per inch)
• Tool steel construction for dimensional stability and wear resistance
• NIST traceability certification included for quality system compliance

Compatibility

Designed for inspection of external NPT tapered pipe threads conforming to the 1/16-27 NPT thread form in production and quality control applications.

Installation Notes

This is a precision gauging tool, not an installed mechanical component. Handle with care to avoid impact, corrosion, or surface contamination that could affect measurement accuracy. Store in a protective case away from cutting fluids and abrasive materials when not in use. Calibration and use should follow applicable ASME B1.20.1 thread gauge standards and your facility quality procedures.