Spi 34-450-7 Threaded Pipe Ring 1-11/2 Npt L1

Product Description

The SPI 34-450-7 is a Class L1 threaded pipe ring used for gauging and verifying external pipe threads to NPT standards. Manufactured from tool steel, this ring gauge is built for dimensional accuracy and long-term durability in precision measurement applications. The 1-11/2 NPT thread configuration makes it the correct gauging tool for inspecting tapered pipe threads of that size. A NIST traceability certification is included, providing documentation required for quality assurance programs and calibration records. Licensed metrology technicians, QA inspectors, and machinists rely on this type of gauge to confirm thread form, pitch, and taper compliance before parts move to assembly or shipment.

This threaded pipe ring is suited for use in manufacturing, fabrication, and inspection environments where NPT pipe thread conformance must be verified to a traceable standard. Class L1 designation indicates the gauge is intended for inspection of product threads at the tighter tolerance boundary, making it appropriate for applications where fit and seal integrity are critical. It is used in plumbing, oil and gas, and fluid-handling component manufacturing wherever ANSI/ASME B1.20.1 NPT thread gauging is required.

Key Features

• Class L1 designation for inspection-grade NPT thread gauging
• 1-11/2 NPT thread size for tapered pipe thread verification
• Tool steel construction for wear resistance and dimensional stability
• NIST traceability certification included for quality and calibration records
• Sold as a single-piece unit with no minimum order beyond one

Compatibility

Designed for gauging external 1-11/2 NPT tapered pipe threads per standard NPT gauging practice. Suitable for use with any workpiece or fitting carrying a 1-11/2 NPT external thread that requires Class L1 inspection.

Installation Notes

This is a precision gauging tool, not a plumbing component. No installation into a piping system is required or intended. Handle with clean, dry hands or lint-free gloves to prevent corrosion on the gauging surfaces. Store in the supplied case or a protective container when not in use to preserve thread accuracy. Calibration intervals should follow the facility quality management plan, and the included NIST certificate should be retained with calibration records.