Spi 19-981-0 Class Zz Minus Plug Pin Gage 0.981 in

Product Description

The SPI 19-981-0 is a Class ZZ minus plug pin gage machined from steel and designed to verify hole diameters to a nominal size of 0.981 inches. Class ZZ gages are manufactured to a minus tolerance, meaning the gage is ground slightly undersized relative to nominal, allowing it to check that a hole falls within the acceptable lower boundary of its specified dimension. With a tolerance of 0.000200 inches, this gage is suited for general-purpose inspection work in production and maintenance environments where consistent hole verification is required. Machinists, quality technicians, and toolroom personnel use plug pin gages as a fast, reliable go/no-go check without the need for measuring instruments or readouts.

This gage is appropriate for use in machine shops, fabrication facilities, and manufacturing quality-control operations. It is applied wherever a 0.981-inch nominal hole must be verified for conformance — including fixture inspection, tooling qualification, and incoming or in-process part verification. The single-ended design is straightforward to use in both benchtop and floor-level inspection settings. It is packaged individually and sold in a minimum order quantity of one unit.

Key Features

• Class ZZ minus tolerance provides a reliable lower-boundary check for 0.981-inch nominal hole diameters
• Tolerance of 0.000200 inches supports general-purpose dimensional inspection
• Steel construction offers durability for repeated use in production environments
• Compact, single-ended form factor requires no calibration equipment at point of use
• Individual packaging keeps the gage protected and ready for immediate deployment

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for inspecting 0.981-inch nominal diameter holes across standard machined components and fixtures.

Installation Notes

Plug pin gages are handled and applied by quality technicians and machinists — no installation in the traditional sense is required. Before use, ensure the gage and the workpiece bore are clean and free of chips, coolant, or debris that could affect the measurement result. Do not force the gage into a hole; Class ZZ minus gages should pass through the bore under light hand pressure if the hole is within tolerance. Store the gage in its protective sleeve or case when not in use to prevent surface damage that could compromise accuracy.