Spi 29-625-1 Class Zz Plus Plug Gage 0.625 Inch

Product Description

The SPI 29-625-1 is a Class ZZ Plus plug gage used to verify the internal diameter of machined holes to a nominal size of 0.625 inches. Built from steel, it delivers a tolerance of 0.0002 inches, making it suitable for go/no-go inspection tasks in production and quality-control environments. Machinists, tool-and-die technicians, and QC inspectors use plug gages like this one to confirm bore dimensions comply with part specifications before assembly. The Class ZZ designation indicates a working-grade gage appropriate for shop-floor inspection of general-tolerance workpieces.

This plug gage is suited for inspecting drilled, reamed, or bored holes in metal, plastic, or composite workpieces where a 0.625-inch nominal diameter must be confirmed. It is typically used in job shop, production machining, and incoming-inspection settings. The compact, lightweight form factor allows one-handed use at the machine or inspection bench without special fixtures.

Key Features

• 0.625-inch nominal diameter for direct go/no-go bore inspection
• 0.0002-inch tolerance for reliable Class ZZ working-grade accuracy
• Steel construction for durability in shop-floor environments
• Lightweight at 0.2 pounds for easy one-handed use
• Single-piece package quantity supports individual tooling purchases

Compatibility

Designed as a working-grade plug gage for inspection of internal bores nominally sized at 0.625 inches across standard machining and quality-control applications.

Installation Notes

Plug gages are used by machinists and quality-control inspectors and require no permanent installation. Ensure the workpiece bore is clean and free of chips or coolant before gauging to prevent false readings or gage wear. Handle the gage carefully to avoid drops that could alter its geometry or surface finish. Periodic calibration against a traceable standard is recommended to maintain measurement integrity over time.