Spi 34-454-9 Threaded Pipe Ring 2-1/2-8 Npt Class L1

Product Description

The SPI 34-454-9 is a Class L1 threaded pipe ring used for gauging and inspecting NPT external threads. This ring gauge confirms that a threaded pipe or fitting meets the dimensional requirements of a 2-1/2-8 NPT thread form. Manufactured from tool steel, it delivers the hardness and wear resistance needed for repeated use on the shop floor or in the field. A NIST traceability certification is included, which supports quality control programs that require documented measurement standards. Licensed metrologists, quality control technicians, and precision machinists are the primary users of this gauge.

This pipe ring gauge is suited for inspection applications in manufacturing, fabrication shops, and mechanical contracting environments where NPT thread conformance must be verified. It is used on pipes, fittings, and threaded components prior to assembly or final inspection. The 2-1/2-8 NPT designation specifies both the nominal pipe size and the thread pitch, making this gauge specific to that thread configuration and not interchangeable with other NPT sizes or thread forms.

Key Features

• Class L1 tolerance classification for go-gauge NPT thread inspection
• 2-1/2-8 NPT thread size for nominal 2-1/2 inch pipe at 8 threads per inch
• Tool steel construction for hardness and long service life under repeated gauging use
• NIST traceability certification included for compliance with documented quality programs
• Single-piece packaging with a minimum order quantity of one

Compatibility

Designed for inspection of external 2-1/2-8 NPT threaded pipe and fittings conforming to the NPT thread standard. Gauge class L1 is specific to go-gauge applications for this thread form and size.

Installation Notes

Threaded pipe ring gauges are handled and applied by quality control technicians or machinists, not installed in a system. Thread gauges should be applied by hand without tools or excessive force. Store the gauge in a protected case when not in use to prevent damage to the thread form. Follow applicable ANSI and ASME gauging standards for proper use and calibration intervals.