Spi 19-810-1 Class Zz Minus Plug Pin Gage 0.8100 in

Product Description

The SPI 19-810-1 is a Class ZZ minus plug pin gage designed to verify that a hole or bore meets its minimum acceptable size. The gage measures a nominal diameter of 0.8100 inches with a minus tolerance of 0.0002 inches, meaning the actual pin diameter is ground to the lower boundary of the tolerance band. Machinists, quality control inspectors, and toolroom technicians use Class ZZ plug gages as a cost-effective go/no-go inspection tool for production and incoming inspection work. The steel construction provides the durability and dimensional stability required for repeatable measurement results.

This pin gage is suited for checking drilled, reamed, or bored holes in manufacturing and fabrication environments where maintaining tight dimensional control is required. It is appropriate for both light production inspection and toolroom use where a Class ZZ tolerance grade meets the application requirement. The minus designation indicates the pin is manufactured to the minus side of nominal, functioning as the go member in a go/no-go gage pair or used as a standalone check for minimum hole size.

Key Features

• Nominal diameter of 0.8100 inches for direct hole size verification
• Class ZZ tolerance grade suitable for production and general inspection use
• Minus designation confirms the pin is ground to the lower tolerance boundary
• Steel construction for dimensional stability and wear resistance
• Compact, lightweight design at 0.2 pounds for easy handling at the inspection station

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in go/no-go gage sets or as a standalone inspection tool for holes with a nominal diameter of 0.8100 inches.

Installation Notes

Plug pin gages are handled and used by machinists, quality technicians, and toolroom personnel — no installation in a mechanical system is required. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could cause false readings or damage the gage surface. Do not force the gage into an undersized hole, as this will damage the ground surface and alter the calibrated diameter. Store the gage in a protective case away from moisture to prevent corrosion and maintain calibration.