Spi 29-871-1 Class Zz Plus Plug Gage 0.871 in

Product Description

The SPI 29-871-1 is a Class ZZ Plus plug gage designed for go/no-go inspection of cylindrical bores and holes with a nominal diameter of 0.871 inches. Built to Class ZZ tolerances, it holds a dimensional tolerance of 0.0002 inches, making it suitable for general-purpose production inspection where close but not ultra-precision tolerance verification is required. The gage body is constructed from steel for wear resistance and dimensional stability. Machinists, quality control technicians, and tool-room professionals use plug gages like this one to confirm that drilled, reamed, or bored features fall within specified limits without requiring a measuring instrument readout.

This plug gage is suited for use in manufacturing, machine shop, and production environments where repetitive bore inspection is performed. It is particularly useful for verifying hole sizes on machined parts, fixtures, and fabricated components where 0.871-inch nominal bores are specified. The Class ZZ designation indicates general-purpose inspection-grade accuracy, appropriate for checking work-piece conformance on production lines and in inspection departments. A single gage covers the 0.871-inch nominal bore size within its stated tolerance band.

Key Features

• Class ZZ Plus tolerance grade for general-purpose production bore inspection
• 0.871-inch nominal measurement diameter for precise go/no-go gauging
• Dimensional tolerance of 0.0002 inches for repeatable inspection accuracy
• Steel construction provides durability and resistance to wear in production use
• Compact and lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as a general-purpose plug gage for verifying cylindrical bores and holes with a 0.871-inch nominal diameter in machined parts, fixtures, and fabricated components across standard production inspection applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and do not require installation in the traditional sense. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect the measurement result. Do not force the gage into an undersized bore, as this can damage the gage or the workpiece. Store the gage in a protective case away from other tooling to prevent nicks and corrosion that would compromise its tolerance integrity.