Spi 19-963-8 Class Zz Minus Plug Pin Gage 0.963 in

Product Description

The SPI 19-963-8 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole diameters in precision inspection and quality control applications. It is designed to the minus tolerance convention, meaning the gage is manufactured at or below the nominal diameter of 0.963 inches, with a tolerance of 0.0002 inches. This gage is used to confirm that a hole is at or above the minimum acceptable size, providing a go or no-go reference in dimensional inspection workflows. Machinists, tool and die makers, and quality technicians use pin gages routinely on the shop floor and in inspection rooms.

This plug pin gage is suited for use in precision manufacturing environments where hole diameter verification is required. Typical applications include checking drilled, reamed, or bored holes in metal components, fixture verification, and incoming or in-process inspection. The Class ZZ designation indicates a commercial-grade tolerance class appropriate for general production inspection rather than laboratory or master-gage applications. The steel construction provides durability for repeated use in shop environments.

Key Features

• Nominal diameter of 0.963 inches for direct bore verification at that size
• Class ZZ minus tolerance convention: manufactured below nominal to 0.0002 inches tolerance
• Steel construction for durability and dimensional stability in shop conditions
• Compact and lightweight at 0.2 pounds for easy single-hand use during inspection
• Individual unit packaging suitable for adding to existing pin gage sets or replacing a worn gage

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general production inspection of 0.963-inch nominal diameter bores and holes across a range of metalworking and manufacturing applications.

Installation Notes

Pin gages should be handled with clean, dry gloves or a rag to prevent corrosion from skin contact. Before use, inspect the gage surface for nicks, burrs, or wear that could affect measurement accuracy. Apply light machine oil or rust inhibitor when storing to preserve the steel surface. Calibration against a traceable standard should be performed periodically per your facility quality plan.