Spi 29-323-3 Class Zz Plus Plug Gage 0.323 in Dia

Product Description

The SPI 29-323-3 is a Class ZZ Plus plug gage machined to a nominal diameter of 0.323 inches with a tolerance of 0.0002 inches. Plug gages are go/no-go inspection tools used to verify that a drilled, reamed, or bored hole falls within a specified dimensional tolerance. The Class ZZ Plus classification designates a tighter tolerance grade appropriate for precision inspection in toolroom and production-floor environments. Constructed from steel, the 29-323-3 delivers the wear resistance and dimensional stability required for repeatable measurement results. Machinists, quality control technicians, and toolroom professionals use this type of gage as part of a standard inspection routine.

This plug gage is suited for dimensional inspection of holes in manufactured parts across light manufacturing, precision machining, and metalworking applications. It is appropriate for both job-shop and production environments where hole diameter conformance must be verified against close tolerances. The 0.323-inch diameter range is common in applications involving drilled or reamed holes for fasteners, dowel pins, and similar features. The gage is used as a handheld inspection tool and does not require mounting fixtures for standard use.

Key Features

• Nominal diameter of 0.323 inches for direct hole inspection at that dimension
• Class ZZ Plus tolerance of 0.0002 inches for precision go/no-go gauging
• Steel construction provides wear resistance and dimensional stability
• Compact, handheld form factor requires no fixture or mounting hardware
• Single-piece package quantity supports individual toolroom or bench use

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in any inspection application requiring verification of a 0.323-inch nominal hole diameter.

Installation Notes

Plug gages are inspection tools installed by machinists or quality control technicians as part of a dimensional verification process. No power source or fasteners are required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Handle carefully to avoid dropping, as impact can alter the gage diameter and invalidate its calibration.