Spi 34-449-9 Threaded Pipe Ring 3/4-14 Npt L1

Product Description

The SPI 34-449-9 is a threaded pipe ring gauge designed for inspecting and verifying 3/4-14 NPT external pipe threads. Classified as Class L1, it provides a go/no-go style functional check to confirm that threaded connections meet dimensional tolerances required for leak-free sealing in pipe assemblies. Manufactured from tool steel, the gauge delivers the hardness and wear resistance needed for repeated use in production and inspection environments. A NIST traceability certification is included, supporting documentation requirements in quality management systems.

This pipe ring gauge is used in manufacturing, machining, and plumbing fabrication settings where NPT thread compliance must be verified before assembly. It is appropriate for inspecting male pipe threads on fittings, valves, nipples, and pipe ends. The Class L1 designation makes it suitable for standard production inspection where tolerance acceptance aligns with ANSI/ASME B1.20.1 pipe thread specifications.

Key Features

• Gauges 3/4-14 NPT external pipe threads to Class L1 tolerance
• Tool steel construction for durability and dimensional stability under repeated use
• NIST traceability certification included for quality and audit compliance
• Go/no-go inspection method confirms thread fit before assembly
• Compact single-piece ring gauge design for handheld use at the workstation or on the floor

Compatibility

Designed for inspection of 3/4-14 NPT male pipe threads per ANSI/ASME B1.20.1 standards on fittings, pipe ends, valves, and threaded components requiring Class L1 acceptance criteria.

Installation Notes

This gauge is used by machinists, quality technicians, and pipefitters to inspect threaded components prior to assembly — it is a measurement tool, not an installed part. Ensure the threaded part being checked is clean and free of chips, burrs, or cutting fluid before gauging. Handle the ring gauge carefully to avoid dropping or impact damage, which can alter calibration. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity.