Spi 19-806-9 Class Zz Minus Plug Pin Gage 0.806 in

Product Description

The SPI 19-806-9 is a Class ZZ minus plug pin gage machined from steel and designed to verify bore and hole diameters in precision inspection and quality control applications. It measures 0.806 inches in diameter with a tolerance of 0.0002 inches, placing it in the Class ZZ specification range suited for general-purpose shop-floor gauging. The minus designation indicates the gage is manufactured to the lower tolerance boundary, which determines the go/no-go decision logic in standard hole inspection workflows. Machinists, quality technicians, and tool room personnel use plug gages like this one to confirm that drilled, reamed, or bored features meet dimensional print requirements.

This gage is used in machine shops, manufacturing facilities, and inspection departments where consistent hole diameter verification is required. It is appropriate for checking holes in metal, plastic, or composite workpieces where a 0.806-inch nominal diameter is specified on the engineering drawing. The steel construction holds up to repeated use in production environments. At 0.2 pounds, the gage is lightweight enough for continuous hand use during inspection runs.

Key Features

• 0.806-inch nominal diameter for precise bore verification
• Class ZZ tolerance class suitable for general-purpose shop inspection
• Minus designation for lower-boundary tolerance gauging
• 0.0002-inch tolerance for repeatable dimensional verification
• Steel construction for durability in production environments
• Lightweight at 0.2 pounds for extended hand use

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for verifying 0.806-inch nominal diameter bores in standard shop inspection and quality control applications.

Installation Notes

Plug pin gages are used by quality technicians and machinists and do not require installation in the traditional sense. Before use, clean both the gage and the bore being measured to remove chips, oil, and debris that could affect readings. Handle the gage carefully to avoid dropping, as impact can alter the ground surface and invalidate the tolerance class. Store in a protective case away from other metal tooling to prevent surface damage.