Spi 19-373-0 Class Zz Minus Plug Pin Gage 0.373 in

Product Description

The SPI 19-373-0 is a Class ZZ minus plug pin gage ground to a nominal diameter of 0.373 inches with a tolerance of 0.0002 inches in the minus direction. Plug pin gages are precision inspection tools used to verify that a drilled, reamed, or bored hole falls within a specified dimensional tolerance. The minus designation means the gage is manufactured at or below the nominal size, confirming a hole is at minimum at the specified dimension. Machined from steel for dimensional stability, this gage is a standard tool in quality control, production inspection, and toolroom applications.

This gage is suited for production floor inspection and metrology lab use where hole diameter verification is required. It is appropriate for checking through-holes and blind holes in machined parts across metalworking, manufacturing, and precision fabrication environments. Inspectors and machinists use plug gages as a fast, reliable go/no-go reference when verifying compliance with dimensional drawings and tolerancing standards.

Key Features

• Nominal diameter of 0.373 inches for direct hole inspection at that size
• Class ZZ tolerance grade suitable for production-level inspection gaging
• Minus designation confirms the gage is ground below nominal, consistent with go-gage function
• Tolerance of 0.0002 inches for precise dimensional verification
• Steel construction provides durability and dimensional stability in shop environments
• Compact and lightweight at 0.2 pounds for easy single-handed use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in any inspection application requiring hole diameter verification at 0.373 inches nominal.

Installation Notes

Plug pin gages are handled and stored by metrology and quality control personnel, not installed in systems. Clean the gage and the hole being checked before use to avoid false readings from debris or burrs. Store the gage in its protective case when not in use to prevent surface damage that would affect accuracy. Calibration intervals should follow your facility quality management system requirements.