Spi 19-937-2 Class Zz Minus Plug Pin Gage 0.937 in

Product Description

The SPI 19-937-2 is a Class ZZ minus plug pin gage machined to a 0.937-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision go/no-go inspection tools used to verify bore diameters, hole sizes, and machined feature dimensions to a defined tolerance class. Class ZZ is the standard commercial tolerance grade, appropriate for general inspection work in production and maintenance environments. This gage is manufactured from steel for durability and dimensional stability. It is used by machinists, quality technicians, tool and die makers, and maintenance professionals who need fast, repeatable bore verification without complex measurement setups.

This pin gage is suited for incoming inspection, in-process quality control, and maintenance verification tasks where a 0.937-inch bore or hole diameter must be confirmed. It fits standard gage handle systems, allowing integration into existing inspection tooling. Typical applications include checking drilled, reamed, or bored holes in metalworking, general manufacturing, and industrial maintenance settings. The minus designation means the gage is ground to the lower boundary of the nominal size, making it a no-go reference for that diameter.

Key Features

• Class ZZ tolerance grade for general commercial inspection use
• Minus designation ground to the lower boundary of the 0.937-inch nominal diameter
• 0.0002-inch tolerance for reliable pass/fail bore verification
• Steel construction provides dimensional stability and resistance to wear
• Compatible with standard plug gage handles for easy integration into existing inspection setups

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional gage handle systems accepting 0.937-inch diameter pin gages in general industrial and manufacturing inspection applications.

Installation Notes

Pin gages are handled and stored by quality technicians and machinists following standard metrology practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Never force a pin gage into a bore; if resistance is encountered, the hole is undersize and the gage should be withdrawn without applying lateral pressure. Follow your facility calibration schedule to confirm gage integrity over time.