Spi 19-386-2 Class Zz Minus Plug Pin Gage 0.386 in

Product Description

The SPI 19-386-2 is a Class ZZ minus plug pin gage with a nominal diameter of 0.386 inches, manufactured from steel. This gage is used to verify hole diameters and bore tolerances in precision machining and quality control applications. It follows the minus tolerance convention, meaning the gage is manufactured to the low side of the nominal dimension, with a tolerance of 0.0002 inches. Machinists, quality technicians, and tool room professionals use plug pin gages like this to perform go/no-go inspections on drilled, reamed, or bored holes during production runs and incoming inspection.

Class ZZ plug gages are standard workshop-grade gages suited for general production inspection where extremely tight master-grade tolerances are not required. The 19-386-2 is appropriate for use in metalworking shops, fabrication facilities, and any manufacturing environment that requires reliable dimensional verification of hole features. Its steel construction provides durability under regular shop-floor use.

Key Features

• Nominal diameter of 0.386 inches for direct hole-size verification
• Class ZZ tolerance grade — standard workshop inspection accuracy
• Minus plug configuration — gage is held to the low side of nominal
• Tolerance of 0.0002 inches for consistent measurement repeatability
• Steel construction for durability in production and tool room environments

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible gage handle holders sized for the 0.386-inch diameter range in general workshop and production inspection applications.

Installation Notes

Plug pin gages are handled and stored by quality technicians and machinists — no power tools or mechanical installation is required. Clean the gage and the bore being checked before use to prevent debris from affecting measurement accuracy. Store the gage in its protective case when not in use to prevent nicking or corrosion that would affect the ground surface. Calibration intervals should follow the facility's established metrology schedule.