Spi 19-811-9 Class Zz Minus Plug Pin Gage 0.811 in

Product Description

The SPI 19-811-9 is a Class ZZ minus plug pin gage designed to verify hole diameters with a nominal size of 0.811 inches. Built from hardened steel, this go-type gage is used to confirm that a bore or hole falls within the specified lower tolerance boundary. The minus designation means the gage is manufactured to the low side of the nominal dimension, with a tolerance of 0.0002 inches. Machinists, quality control technicians, and toolroom professionals use plug pin gages like this one as a fast, reliable method for in-process and final inspection of drilled, reamed, or bored features.

This gage is suited for use in precision machining, metalworking, and quality inspection environments where tight dimensional control is required. It is appropriate for both job-shop and production-floor inspection of ferrous and non-ferrous workpieces. The 0.811-inch diameter size is a standard inch-series gage applicable to a wide range of mechanical components and tooling setups requiring verification of that nominal bore dimension.

Key Features

• Class ZZ tolerance class — designed for general-purpose inspection and toolroom use
• Minus plug configuration checks the lower tolerance boundary of a bore or hole
• Tolerance of 0.0002 inches provides reliable dimensional verification
• 0.811-inch nominal diameter in hardened steel construction
• Compact and lightweight at 0.2 pounds for easy handheld use

Compatibility

Designed as a general-purpose inch-series plug pin gage for inspecting holes and bores with a nominal diameter of 0.811 inches in standard machining and quality control applications.

Installation Notes

Plug pin gages are handled and used by machinists and quality control inspectors, not installed in a permanent sense. Clean the gage and the bore being checked before use to avoid false readings caused by debris or cutting fluid residue. Do not force the gage into a hole — if it does not enter freely, the bore is undersize. Store the gage in its protective case when not in use to prevent damage to the precision-ground surface.