Spi 29-817-4 Class Zz Plus Plug Gage 0.817 in

Product Description

The SPI 29-817-4 is a Class ZZ Plus plug gage designed for precise hole diameter inspection in machining and quality-control applications. It measures bore diameters at 0.817 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go verification work where tight dimensional accuracy is required. Constructed from steel, the gage resists wear during repeated use in production and inspection environments. Machinists, toolmakers, and quality technicians use this type of gage to verify that drilled, bored, or reamed holes fall within specified limits before parts advance in the manufacturing process.

This plug gage is used in machine shops, manufacturing facilities, and tool rooms where hole diameter verification is part of standard inspection protocol. It fits into processes involving precision-machined components across general metalworking, automotive, aerospace, and industrial equipment production. The 0.817-inch measurement diameter addresses a common bore size encountered in mid-range precision work, and the Class ZZ Plus designation indicates it meets standard gage tolerance classifications for this category of inspection tooling.

Key Features

• 0.817-inch diameter for direct hole inspection at a common bore size
• 0.0002-inch tolerance meets Class ZZ Plus gage accuracy standards
• Steel construction for durability and resistance to wear during repeated use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station
• Single-piece packaging with a minimum order quantity of 1

Compatibility

Designed as a go/no-go style plug gage for use in standard bore inspection applications requiring a 0.817-inch diameter measurement with Class ZZ Plus tolerance specifications.

Installation Notes

Plug gages are used by machinists and quality control technicians and do not require mechanical installation. Before use, clean both the gage and the bore being inspected to remove chips, coolant, and debris that could affect measurement accuracy. Handle the gage carefully to avoid dropping or impacting it, as damage to the precision ground surface will compromise tolerance integrity. Calibration and periodic re-certification should follow your facility's gage management procedures in accordance with applicable quality standards such as ISO 10012 or ANSI Z540.