Spi 19-280-7 Class Zz Minus Plug Pin Gage 0.28 in Steel

Product Description

The SPI 19-280-7 is a Class ZZ minus plug pin gage used to verify bore and hole diameters to a precise tolerance. This gage measures a nominal diameter of 0.28 inches with a tolerance of 0.0002 inches in the minus direction, confirming that a feature meets its minimum acceptable size. Constructed from steel for durability and dimensional stability, it is a standard hand tool used by machinists, quality control technicians, and tool-and-die professionals in manufacturing and inspection environments.

This plug pin gage is suited for go/no-go inspection routines in machine shops, production floors, and quality labs. Class ZZ is a widely accepted standard for working gages used in general-purpose dimensional inspection. It is appropriate for checking drilled, reamed, or bored holes where tolerance verification is required as part of a quality assurance process.

Key Features

• Class ZZ minus tolerance for working-gage inspection applications
• Nominal diameter of 0.28 inches for precise hole verification
• Tolerance of 0.0002 inches ensures close dimensional control
• Steel construction provides durability and long service life
• Compact and lightweight at 0.2 pounds for easy hand use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general-purpose dimensional inspection of bored, drilled, or reamed holes at a nominal diameter of 0.28 inches.

Installation Notes

Plug pin gages are handled and used by machinists and quality control inspectors and require no installation in the conventional sense. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into a bore, as this can damage the gage or the workpiece and compromise measurement accuracy. Store in a protective case away from temperature extremes to maintain dimensional stability.