Spi 29-707-7 Class Zz Plus Plug Gage 0.707 in Steel

Product Description

The SPI 29-707-7 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in manufacturing, machining, and quality-control applications. It measures a nominal diameter of 0.707 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where tight dimensional verification is required. The gage is constructed from steel for durability and resistance to wear during repeated use. Machinists, quality technicians, and tool-room professionals use plug gages like this one to verify that drilled, reamed, or bored holes fall within specified tolerances before parts move to the next stage of production.

This plug gage is used in precision machining shops, tool rooms, and quality-assurance environments where hole diameter conformance must be confirmed to close tolerances. It is appropriate for both production floor inspection and incoming-material verification. The 0.707-inch diameter targets a specific bore size common in component manufacturing, and the Class ZZ Plus classification designates the accuracy grade of the gage itself, indicating a tighter manufactured tolerance than standard Class ZZ gages.

Key Features

• Nominal measurement diameter of 0.707 inches for targeted bore inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus accuracy requirements
• Steel construction provides wear resistance for repeated inspection cycles
• Compact and lightweight at 0.2 pounds for easy single-handed use
• Single-piece package quantity suits individual technician or tool-crib inventory

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any go/no-go inspection setup requiring a 0.707-inch diameter Class ZZ Plus gage in standard steel construction.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Before use, verify the gage and workpiece are at the same ambient temperature to avoid thermal expansion errors, particularly in close-tolerance applications. Store the gage in its protective case when not in use and apply a light coat of rust-preventive oil for long-term storage. Gage calibration should be verified against a traceable standard at intervals consistent with your shop quality plan.