Spi 29-138-5 Class Zz Plus Plug Gage 0.138 in

Product Description

The SPI 29-138-5 is a Class ZZ Plus plug gage designed for precision go/no-go measurement of small bores and holes at 0.138 inches in diameter. Built from steel, this gage delivers a tolerance of 0.0002 inches, making it suitable for inspection and quality control tasks where tight dimensional verification is required. Machinists, tool-and-die technicians, and quality control professionals use Class ZZ plug gages during incoming inspection, in-process checks, and final part verification on the shop floor or in the inspection room.

This gage is used wherever a 0.138-inch bore or drilled hole must be confirmed to print dimensions. Typical applications include inspection of precision-machined components in manufacturing environments. It is well suited for use in machine shops, production facilities, and inspection departments working with tight-tolerance parts where a reliable, handheld go/no-go check is needed.

Key Features

• Class ZZ Plus tolerance rating for precise go/no-go bore inspection
• 0.138-inch measurement diameter with a 0.0002-inch tolerance
• Steel construction for durability in shop and inspection environments
• Compact, lightweight design at 0.2 pounds for easy handheld use
• Single-piece package quantity for individual replacement or addition to a gage set

Compatibility

Designed as an OEM-style plug gage for verifying 0.138-inch diameter bores in precision-machined parts across general manufacturing and inspection applications.

Installation Notes

Plug gages are handled and used by quality control technicians and machinists — no installation in a system is required. Before use, ensure the gage and the workpiece bore are clean and free of chips, coolant, or debris. Do not force the gage into a bore; apply light, consistent hand pressure only to avoid damage to the gage or part surface. Store in a protective case away from temperature extremes to maintain dimensional accuracy.