Spi 29-131-0 Class Zz Plus Plug Gage 0.131 in Dia

Product Description

The SPI 29-131-0 is a Class ZZ Plus plug gage designed for precision hole measurement in manufacturing and inspection environments. It measures bore diameters at 0.131 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows where tight dimensional control is required. The gage is constructed from steel for durability and dimensional stability. Machinists, quality control technicians, and tool-room professionals use plug gages like this one to verify that drilled, reamed, or bored holes fall within specified tolerance ranges before parts move to the next stage of production.

This plug gage is used in precision machining shops, tool rooms, and quality inspection departments. It is appropriate for checking small-diameter holes in both production and incoming inspection settings. The 0.131-inch nominal diameter makes it well suited for verifying holes produced by standard twist drills or reamers at or near that size. It is commonly used in light manufacturing, aerospace component inspection, and general metalworking applications where Class ZZ tolerance levels meet the required inspection standard.

Key Features

• Nominal measurement diameter of 0.131 inches for precise small-bore inspection
• Class ZZ Plus tolerance rating at 0.0002 inches for reliable go/no-go verification
• Steel construction provides wear resistance and long-term dimensional stability
• Compact, single-piece design suitable for bench or in-process inspection
• Individual unit packaging supports organized gage management and storage

Compatibility

Designed as an OEM-style Class ZZ Plus plug gage for use with standard go/no-go gage handle sets compatible with 0.131-inch diameter pin gages in precision inspection applications.

Installation Notes

Plug gages should be handled and stored by qualified inspection or machining personnel following established metrology practices. Clean the gage and the bore being checked before use to prevent false readings caused by chips or debris. Do not force the gage into the bore; apply light, consistent hand pressure only. Calibrate and re-check gage wear periodically per your shop's quality management procedures to maintain measurement integrity.