Spi 29-339-9 Class Zz Plus Plug Gage 0.339 Inch

Product Description

The SPI 29-339-9 is a Class ZZ Plus plug gage designed for precision bore and hole inspection in machining, manufacturing, and quality control environments. Built to a 0.339-inch nominal diameter with a tolerance of 0.0002 inches, this gage gives machinists and inspectors a reliable go/no-go reference for verifying hole size conformance to print. The steel construction provides durability under regular shop-floor use. Class ZZ Plus gages are suitable for checking production parts where dimensional accuracy is critical and consistent measurement repeatability is required.

This plug gage is intended for use in production inspection, incoming quality control, and toolroom verification tasks. It is well suited for checking drilled, reamed, or bored holes in metal components across general manufacturing and precision machining applications. The 0.339-inch diameter makes it appropriate for small-bore inspection work where tighter tolerance classes such as Class X or XX are not required and Class ZZ Plus provides a cost-effective standard.

Key Features

• Class ZZ Plus tolerance class for general-purpose production inspection
• 0.339-inch nominal diameter with 0.0002-inch tolerance
• Steel construction for durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece package quantity for individual toolroom or inspection station use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for standard small-bore inspection applications requiring a 0.339-inch Class ZZ Plus reference standard.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and toolroom inspectors. Clean the gage and the bore being measured before use to prevent debris from affecting readings or causing galling. Do not force the gage into a hole; forced insertion can damage the gage surface and compromise accuracy. Store in a protective case away from other metal tooling to prevent surface wear between inspections.