Spi 29-909-9 Class Zz Plus Plug Gage 0.909 in

Product Description

The SPI 29-909-9 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.909 inches. Built from steel, this go/no-go style inspection tool holds a tolerance of 0.0002 inches, making it suitable for precision quality-control work in machine shops, manufacturing facilities, and maintenance environments. Machinists, toolmakers, and quality technicians use plug gages like this one to confirm that drilled, reamed, or bored holes fall within specified dimensional limits before parts move to the next stage of production or assembly.

Class ZZ Plus plug gages are typically used for general-purpose inspection of production parts where close but not ultra-precision tolerances are required. This gage is appropriate for checking hole diameters in steel, aluminum, cast iron, and similar workpiece materials. It is commonly used in job-shop and production-line inspection routines, tool crib verification, and incoming material inspection. The 0.909-inch nominal diameter targets mid-range bore sizes found in a wide variety of mechanical components and fixtures.

Key Features

• Nominal measurement diameter of 0.909 inches for direct bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go inspection
• Steel construction for durability and resistance to wear during repeated use
• Compact form factor at 0.2 pounds for easy handheld use at the machine or inspection station
• Single-piece packaging suitable for individual replacement or toolroom stocking

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose bore inspection of holes with a nominal diameter of 0.909 inches in production and quality-control applications.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality-control technicians - no installation in the traditional sense is required. Store the gage in its protective case or sleeve when not in use to prevent nicking the gage surface. Clean the gage and the bore being checked before use to avoid false readings caused by chips or debris. Handle with clean, dry hands or cotton gloves to prevent corrosion from skin contact.