Spi 29-640-0 Class Zz Plus Plug Gage 0.64 Inch

Product Description

The SPI 29-640-0 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machine shops, manufacturing environments, and quality control applications. Built from steel, this fixed-limit plug gage checks a 0.64-inch nominal diameter with a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards. It provides a fast, reliable go/no-go style check for machinists and quality technicians who need to verify hole dimensions to close tolerances without relying on variable measurement instruments. The compact form factor and 0.2-pound weight make it easy to handle during production floor inspection.

This plug gage is suited for incoming inspection, in-process gauging, and final inspection of bored, drilled, or reamed holes at the 0.64-inch diameter class. It is commonly used in general metalworking, toolroom, and precision manufacturing settings where verifying hole size to Class ZZ Plus limits is required. Machinists, quality control inspectors, and tool-and-die professionals are the primary users of this type of gage in both job shop and production environments.

Key Features

• 0.64-inch nominal diameter measurement for fixed-limit hole checking
• Class ZZ Plus tolerance of 0.0002 inches for high-accuracy go/no-go inspection
• Steel construction for durability and dimensional stability under shop conditions
• Lightweight at 0.2 pounds for easy single-hand use during inspection
• Single-piece package quantity suitable for individual toolroom and quality lab use

Compatibility

Designed as an OEM-style fixed-limit plug gage for use wherever Class ZZ Plus bore inspection at 0.64-inch nominal diameter is required in standard metalworking and manufacturing inspection applications.

Installation Notes

Plug gages are used by quality control inspectors and machinists and require no installation in the traditional sense. Before use, clean the gage and the workpiece bore thoroughly to remove chips, coolant, and debris that could affect measurement accuracy. Handle the gage with care to avoid dropping or contacting abrasive surfaces, as damage to the gage surface will compromise tolerance accuracy. Store the gage in its protective case or on a padded surface away from other tooling to prevent wear.