Spi 29-215-1 Class Zz Plus Plug Gage 0.215 in

Product Description

The SPI 29-215-1 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of drilled, reamed, or bored holes. It measures a nominal diameter of 0.215 inches with a tolerance of 0.0002 inches, providing reliable pass/fail verification for tight-tolerance machining work. The gage body is constructed from steel for durability in shop-floor environments. Machinists, tool and die makers, and quality control technicians use plug gages like this one as a fast, repeatable method to confirm hole size without relying on a measuring instrument readout.

This plug gage is suited for use in manufacturing, metalworking, and precision machining operations where hole diameter conformance must be verified against a defined specification. It is appropriate for both production inspection and incoming quality checks. The 0.215-inch size targets a specific bore dimension common in light mechanical assemblies, jig and fixture work, and component fabrication. Class ZZ Plus designation indicates a commercial-grade tolerance suitable for general inspection use rather than master or working gage applications.

Key Features

• 0.215 inches nominal measurement diameter for precise hole inspection
• 0.0002 inches tolerance — Class ZZ Plus grade for commercial inspection work
• Steel construction for wear resistance and dimensional stability
• Compact, lightweight design at 0.2 pounds for easy single-hand use
• Go/no-go format enables fast pass/fail decisions without a readout device

Compatibility

Designed as a direct-use plug gage for inspecting holes with a nominal diameter of 0.215 inches in steel, aluminum, and similar workpiece materials across standard machining and fabrication applications.

Installation Notes

Plug gages are handled and used by machinists or quality control personnel — no power tools or electrical shutoff is required. Store the gage in a protective case away from chips, coolant, and abrasive surfaces to preserve the lapped measuring surface. Do not force the gage into an undersized hole, as this will damage the gage and produce inaccurate results. Clean both the gage and the workpiece hole before inspection to remove burrs or debris that could affect the reading.