Spi 29-803-4 Class Zz Plus Plug Gage 0.803 in

Product Description

The SPI 29-803-4 is a Class ZZ Plus plug gage designed for precision hole measurement in machining and quality-control applications. With a nominal diameter of 0.803 inches and a tolerance of 0.0002 inches, this gage provides reliable go/no-go verification for bored, drilled, or reamed holes. Constructed from steel, the 29-803-4 offers the hardness and wear resistance required for repeated use in shop-floor inspection. It is a standard tool for machinists, toolmakers, and QC inspectors working to tight dimensional requirements.

This plug gage is suited for use in precision manufacturing environments where hole diameter verification is part of the inspection process. Typical applications include checking finished bores in metal components, verifying tooled features before assembly, and confirming that drilled or reamed holes meet drawing tolerances. The Class ZZ Plus classification designates the gage's own tolerance grade, making it appropriate for general-purpose inspection in production settings rather than master or reference-grade metrology.

Key Features

• Nominal measurement diameter of 0.803 inches for targeted hole inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus classification requirements
• Steel construction provides durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds, easy to handle during inspection routines
• Single-piece packaging supports individual purchase and tool-crib stocking

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose hole inspection of 0.803-inch nominal diameter features in machined metal components.

Installation Notes

Plug gages are used by machinists and QC inspectors and require no installation. Before use, ensure the gage and workpiece are at the same ambient temperature to avoid thermal expansion errors. Keep the gage clean and lightly oiled when stored to prevent corrosion. Never force the gage through a hole; if resistance is felt, the bore may be undersize or contain burrs that require attention before re-gauging.