Spi 29-818-2 Class Zz Plus Plug Gage 0.818 in

Product Description

The SPI 29-818-2 is a Class ZZ Plus plug gage designed to verify hole diameters in precision machining and inspection applications. It measures a nominal diameter of 0.818 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows where tight dimensional control is required. Constructed from steel for durability and dimensional stability, this gage is a standard tool for machinists, toolmakers, and quality control technicians working to close tolerances on drilled, reamed, or bored features.

This plug gage is used in machine shops, manufacturing facilities, and inspection departments to confirm that bored or drilled holes fall within specified dimensional limits. Class ZZ Plus gages are commonly applied in production inspection where periodic checking of hole diameter is needed to maintain process control. The 29-818-2 is appropriate for use on both ferrous and non-ferrous workpieces where a 0.818-inch nominal hole size is specified.

Key Features

• Nominal measurement diameter of 0.818 inches for precise hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for reliable go/no-go verification
• Steel construction provides dimensional stability and resistance to wear
• Single-piece package quantity suits individual bench or field inspection use

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in go/no-go inspection setups requiring a 0.818-inch nominal diameter measurement.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality control inspectors. Clean and lightly oil the gage before use to prevent corrosion and ensure accurate contact. Do not force the gage into a hole, as this can damage the gage or alter the workpiece feature. Store in a protective case away from temperature extremes to maintain calibration integrity.