Spi 29-161-7 Class Zz Plus Plug Gage 0.161 in Dia

Product Description

The SPI 29-161-7 is a Class ZZ Plus plug gage designed for precision hole measurement in machining and manufacturing environments. Built to a tolerance of 0.0002 inches, this go/no-go style gage provides reliable dimensional verification of bored, drilled, or reamed holes at a nominal diameter of 0.161 inches. The steel construction delivers the hardness and wear resistance required for repeated use on the shop floor. Machinists, quality control technicians, and toolroom professionals rely on Class ZZ Plus gages for in-process and final inspection of close-tolerance work.

This plug gage is suited for use in precision manufacturing, tool and die, and quality assurance applications where accurate small-bore measurement is critical. It is appropriate for both job shop and production environments where consistent hole diameter verification is required. The 0.161-inch nominal size targets a specific range of drilled or reamed bore work common in light mechanical and instrument assembly.

Key Features

• Class ZZ Plus tolerance rating of 0.0002 inches for precision go/no-go measurement
• Nominal measurement diameter of 0.161 inches
• Steel construction for durability and wear resistance in production use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station
• Single-piece packaging suitable for individual replacement or kit supplement

Compatibility

Designed as an OEM-style precision measurement tool for use in standard plug gage handles and holders sized to accept small-diameter Class ZZ Plus gage members.

Installation Notes

Plug gages are installed and used by machinists and quality technicians following standard metrology practices. Handle the gage member with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store the gage in its protective case when not in use and keep it away from abrasive surfaces. Calibration intervals should follow the facility quality plan and applicable ASME B89 standards.