Spi 29-386-0 Class Zz Plus Plug Gage 0.386 in

Product Description

The SPI 29-386-0 is a Class ZZ Plus plug gage designed for verifying bore and hole diameters to a precise measurement standard. Built from steel, this go/no-go style gage checks a nominal diameter of 0.386 inches with a tolerance of 0.0002 inches. It is used in production inspection, quality control, and dimensional verification workflows where consistent, repeatable results are required. Machinists, tool and die technicians, and quality inspectors are the typical end users.

This plug gage is suited for use in machine shops, manufacturing facilities, and any environment where hole diameter conformance must be confirmed against a fixed standard. The 0.386-inch nominal size and Class ZZ Plus classification make it appropriate for general-purpose inspection of holes machined to that diameter in both ferrous and non-ferrous workpieces.

Key Features

• Nominal diameter of 0.386 inches for direct go/no-go hole inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for reliable dimensional verification
• Steel construction for durability and wear resistance in production environments
• Compact, single-piece design suited for bench and in-process inspection

Compatibility

Designed as an OEM-style inspection gage for verifying bores and holes with a nominal diameter of 0.386 inches per Class ZZ Plus standards.

Installation Notes

Plug gages are handled by machinists or quality control technicians and do not require power tools or electrical shutoff procedures. Store the gage in a clean, dry environment to prevent corrosion and protect the ground surfaces. Handle with care to avoid dropping, as impact damage can alter the gage diameter and invalidate measurements. Calibration should be verified periodically against a traceable standard per applicable inspection protocols.