Spi 29-397-7 Class Zz Plus Plug Gage 0.397 in

Product Description

The SPI 29-397-7 is a Class ZZ Plus plug gage designed for precision go/no-go inspection of machined bores and holes with a nominal diameter of 0.397 inches. Built to Class ZZ tolerances, this gage holds a tolerance of 0.0002 inches, making it suitable for inspection tasks that require verified dimensional accuracy. Constructed from steel for durability and wear resistance, it is a standard tool for quality control professionals, machinists, and toolroom technicians working in manufacturing and production environments.

This plug gage is used for checking internal diameters in machined components, castings, and fabricated parts during incoming inspection, in-process gauging, or final inspection. It is appropriate for both job shop and production floor environments where consistent bore verification is required. The compact size and single-diameter design make it straightforward to use at the machine or inspection bench.

Key Features

• Nominal measurement diameter of 0.397 inches for precise bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go gauging
• Steel construction for durability and dimensional stability
• Single-piece design suited for bench or floor inspection use
• Lightweight at 0.2 pounds for easy one-handed operation

Compatibility

Designed as an OEM-style replacement or standard addition to toolroom plug gage sets for inspecting bores with a 0.397-inch nominal diameter in machined metal components.

Installation Notes

Plug gages are handled and used by machinists, quality control inspectors, and toolroom technicians. Clean the gage and the workpiece bore before use to prevent debris from affecting readings. Do not force the gage into a bore, as this can damage the gage land and compromise accuracy. Store in a protective case away from temperature extremes to maintain dimensional stability.