Spi 19-784-8 Class Zz Minus Plug Pin Gage 0.784 in

Product Description

The SPI 19-784-8 is a Class ZZ minus plug pin gage machined to a 0.784-inch nominal diameter with a tolerance of 0.0002 inches. Pin gages in this class are used for go/no-go inspection work where dimensional verification of bored holes, drilled passages, and machined features is required. The minus designation means the gage is ground to the lower boundary of the tolerance band, making it appropriate for checking minimum hole size. Constructed from steel for durability and dimensional stability, this gage is a standard inspection tool for quality control and in-process measurement in machine shops, fabrication facilities, and assembly operations.

This gage is suited for dimensional inspection applications in precision manufacturing environments. It is used to verify that hole diameters meet minimum specification before assembly or further machining. Typical users include machinists, quality control inspectors, and tooling technicians working with tight-tolerance components. The 0.784-inch diameter range fits common mid-size bore inspection tasks encountered in general metalworking and industrial fabrication.

Key Features

• Class ZZ minus tolerance ground to 0.0002 inches for accurate minimum-boundary inspection
• 0.784-inch nominal diameter covers common mid-range bore sizes
• Steel construction provides dimensional stability and resistance to wear during repeated use
• Minus designation confirms suitability for verifying minimum acceptable hole diameter
• Single-piece gage design for straightforward hand-held inspection use

Compatibility

Designed as an OEM-style go/no-go inspection gage for use with standard plug gage handles and holders accepting 0.784-inch diameter pin gages in Class ZZ tolerance applications.

Installation Notes

Pin gages are handled and stored by metrology technicians and quality inspectors following standard gage care practices. Keep the gage clean and lightly oiled when stored to prevent corrosion. Do not force the gage into a bore — if resistance is felt, the hole is undersize. Allow the gage and workpiece to reach the same ambient temperature before measuring to avoid thermal expansion errors.