Spi 29-676-4 Class Zz Plus Plug Gage 0.676 in

Product Description

The SPI 29-676-4 is a Class ZZ Plus plug gage designed for precision hole measurement in machining and quality control applications. It measures a nominal bore diameter of 0.676 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where tight dimensional control is required. Constructed from steel, this gage provides the durability and wear resistance expected in a production shop or inspection room environment. Machinists, tool and die makers, and quality assurance technicians use plug gages like this one to verify that drilled, reamed, or bored holes fall within specified tolerance bands.

This plug gage is intended for use in dimensional inspection of precision bores in manufacturing and fabrication settings. Class ZZ Plus gages are appropriate for general-purpose production inspection where hole diameter verification is a routine part of the quality process. Typical applications include checking bored holes in metal parts, castings, or machined components prior to assembly. The compact size and low weight of 0.2 pounds make it easy to handle at the bench or on the shop floor.

Key Features

• Nominal measurement diameter of 0.676 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches meets standard go/no-go inspection requirements
• Steel construction provides wear resistance for repeated production use
• Lightweight at 0.2 pounds for easy single-hand use
• Single-piece packaging suitable for individual replacement or addition to an existing gage set

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose inspection of 0.676-inch nominal diameter bores in machined metal components.

Installation Notes

Plug gages should be handled and stored carefully to prevent nicks, burrs, or surface contamination that can affect measurement accuracy. Clean both the gage and the bore with a lint-free cloth before use. Never force a plug gage into a hole; apply only light, consistent hand pressure to avoid false readings or gage wear. Periodic calibration against a certified master is recommended to maintain measurement integrity.