Spi 29-337-3 Class Zz Plus Plug Gage 0.337 in

Product Description

The SPI 29-337-3 is a Class ZZ Plus plug gage designed for go/no-go inspection of bored, reamed, or drilled holes with a nominal diameter of 0.337 inches. Built to Class ZZ Plus tolerances, this gage holds a dimensional tolerance of 0.0002 inches, making it suitable for quality control tasks in production and machine shop environments. The steel construction provides durability for repeated use in high-cycle inspection routines. Machinists, QC technicians, and tool room professionals use plug gages of this type to verify hole conformance quickly without the need for measuring instruments that require interpretation.

This plug gage is used in production inspection, incoming inspection, and first-article verification across metalworking, fabrication, and precision machining environments. It is well-suited for residential and commercial shop use wherever hole diameter verification to close tolerances is required. Typical applications include checking drilled or reamed holes in steel, aluminum, or plastic workpieces to confirm dimensional compliance before assembly.

Key Features

• Nominal measurement diameter of 0.337 inches for targeted hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go gauging
• Steel construction for wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece packaging suitable for individual tooling procurement

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in go/no-go hole inspection setups compatible with 0.337-inch nominal diameter applications in general machining and quality control environments.

Installation Notes

Plug gages are handled by machinists and QC inspectors and do not require power or mechanical installation. Clean the gage and the workpiece bore before use to avoid false readings from debris or cutting fluid. Do not force the gage into a hole; apply light, consistent hand pressure only. Store in a protective case away from abrasive surfaces to preserve the ground finish and dimensional accuracy.