Spi 29-891-9 Class Zz Plus Plug Gage 0.891 in Dia

Product Description

The SPI 29-891-9 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of cylindrical bores and holes with a nominal diameter of 0.891 inches. Built to Class ZZ Plus tolerances of 0.0002 inches, this gage provides reliable go/no-go inspection for production and quality-control environments. The steel construction delivers the durability and wear resistance required for repeated use on the shop floor. Machinists, quality technicians, and toolroom professionals use plug gages like this one to confirm that drilled, reamed, or bored holes fall within specification before parts move to the next stage of production.

This plug gage is suited for inspection of machined components in manufacturing, fabrication, and toolroom settings. It is appropriate for both production-line spot checks and incoming material inspection. The 0.891-inch nominal size covers a common bore diameter found in precision machined parts across general metalworking, automotive, and industrial equipment applications. Sold as a single gage unit, it integrates directly into standard go/no-go inspection procedures without additional tooling.

Key Features

• Nominal bore diameter of 0.891 inches for precise hole verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable dimensional inspection
• Steel construction for durability and long service life in production environments
• Single-unit packaging suitable for individual station or toolroom use
• Consistent with standard go/no-go plug gage inspection methodology

Compatibility

Designed as an OEM-style inspection gage for verifying cylindrical bores with a nominal diameter of 0.891 inches in standard go/no-go plug gage applications.

Installation Notes

Plug gages are handled and used by quality technicians and machinists following standard metrology practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Do not force the gage into a bore; excessive insertion force can damage the gage or the workpiece and will produce inaccurate results. Store the gage in its case away from temperature extremes to preserve dimensional stability.