Spi 29-284-7 Class Zz Plus Plug Gage 0.284 in

Product Description

The SPI 29-284-7 is a Class ZZ Plus plug gage designed to verify bore and hole diameters with a nominal measurement diameter of 0.284 inches and a tolerance of 0.0002 inches. Class ZZ gages are the standard grade for general inspection work in production environments, providing a reliable go/no-go reference for machinists, quality control technicians, and toolroom personnel. The steel construction ensures durability through repeated use in shop-floor conditions. This gage ships individually and is suited for dimensional verification tasks where consistent, repeatable measurement is required.

This plug gage is used in manufacturing, machining, and quality assurance settings where hole diameter conformance must be verified to tight tolerances. It is appropriate for incoming inspection, in-process checking, and final inspection of drilled, reamed, or bored holes. Typical installations involve handheld use with no special tooling required, making it a practical addition to any metrology or inspection station in a production or toolroom environment.

Key Features

• Class ZZ Plus tolerance grade for general production inspection
• Nominal measurement diameter of 0.284 inches
• Tolerance of 0.0002 inches for precise go/no-go verification
• Steel construction for durability in shop-floor use
• Single-piece package, ready for immediate use

Compatibility

Designed as a standard-grade plug gage for verifying 0.284-inch nominal bore and hole diameters in general machining and inspection applications.

Installation Notes

Plug gages are handled and used by machinists, toolroom technicians, and quality control inspectors without special installation procedures. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel surface. Do not force the gage into a hole; excessive insertion force can damage both the gage and the workpiece. Store in a protective case away from abrasive materials to maintain calibration integrity.