Spi 19-322-7 Class Zz Minus Plug Pin Gage 0.322 in

Product Description

The SPI 19-322-7 is a Class ZZ minus plug pin gage designed to verify hole diameters and bore tolerances in precision machining and inspection applications. With a nominal diameter of 0.322 inches and a tolerance of 0.0002 inches, this gage delivers the accuracy required for go/no-go inspection routines. Constructed from steel, it provides the wear resistance and dimensional stability that high-cycle inspection work demands. Machinists, quality technicians, and tool room personnel use Class ZZ gages as a reliable reference for confirming whether a feature falls within specified limits.

This plug pin gage is suited for use in machine shops, manufacturing cells, and quality control labs where tight-tolerance hole verification is required. It is appropriate for inspecting drilled, reamed, or bored holes in production and job-shop environments. Class ZZ is the standard tolerance grade for general-purpose inspection gages, making the 19-322-7 a practical choice for routine dimensional checks on steel, aluminum, and similar workpiece materials.

Key Features

• Nominal diameter of 0.322 inches for precise hole and bore verification
• Class ZZ tolerance grade at 0.0002 inches for general-purpose inspection use
• Minus designation indicates the gage falls below nominal, consistent with go-gage practice
• Steel construction provides dimensional stability and resistance to wear
• Compact form factor supports easy handling during bench or in-process inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for verifying 0.322-inch nominal diameter features in standard go/no-go inspection setups.

Installation Notes

Plug pin gages are used by quality technicians and machinists and require no installation in the traditional sense, but proper handling is essential for accurate results. Store the gage in its protective case when not in use and clean both the gage and the workpiece bore before measurement to prevent false readings. Never force the gage into a hole; if resistance is felt, the feature is likely undersize. Periodic recalibration against a certified master is recommended to maintain traceability.