Spi 37-163-3 Plug Thread Gage M20x1.5 6H No Go

Product Description

The SPI 37-163-3 is a single-end plug thread gage used to verify M20x1.5 internal threads to the 6H tolerance class. It is a No Go member, meaning it confirms that threads are not oversized or out of tolerance on the maximum material condition side. Manufactured to ANSI standards and traceable to NIST, this gage delivers the accuracy required for precision thread inspection in machining, manufacturing, and mechanical assembly environments. A separate handle is required and is not included. The part weighs 0.22 pounds and measures 1.5 inches in length with a 0.79-inch width and 0.79-inch height.

This plug gage is suited for use in production inspection and quality control settings where M20x1.5 threaded holes must be verified against 6H class fit requirements. Typical applications include machined components in industrial equipment, automotive assemblies, and structural mechanical systems. Machinists, quality technicians, and metrology personnel use this gage on the shop floor or in inspection rooms to reject parts with out-of-tolerance internal threads before assembly.

Key Features

• No Go member for 6H class M20x1.5 internal thread verification
• Single-end design for dedicated No Go inspection
• Traceable to NIST with ANSI certification included
• Compact and lightweight at 0.22 pounds for easy bench or floor use
• Handle sold separately, compatible with standard plug gage handles

Compatibility

Designed for inspection of M20x1.5 internal threads meeting 6H tolerance class specifications. Handle is not included and must be sourced separately to complete the gage assembly.

Installation Notes

Thread plug gages are used by quality technicians and machinists and require no installation in the traditional sense. Before use, ensure the threaded workpiece is clean and free of burrs, chips, or coolant residue that could affect gage readings. Do not force the No Go member into a conforming thread; entry resistance is expected and forcing can damage the gage. Store in a protective case away from impact and temperature extremes to maintain calibration integrity.