Spi 29-307-6 Class Zz Plus Plug Gage 0.307 in

Product Description

The SPI 29-307-6 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machining, quality control, and inspection environments. Built from steel, this go/no-go style gage checks whether a drilled, reamed, or bored hole falls within tolerance. The nominal measurement diameter is 0.307 inches with a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards. Machinists, tool and die makers, and quality technicians use plug gages like this one to verify hole size quickly and reliably without the need for electronic instrumentation.

The 29-307-6 is suited for production floor inspection, incoming material verification, and setup validation on CNC or manual machining operations. It is appropriate for both light manufacturing and precision shops where hole tolerances are held to close limits. The compact size and straightforward application make it a standard tool in any inspection kit handling parts in the 0.307-inch bore range.

Key Features

• Nominal measurement diameter of 0.307 inches for consistent bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable pass/fail inspection
• Steel construction for durability and dimensional stability under shop conditions
• Single-piece package quantity for individual tool procurement or kit replenishment

Compatibility

Designed as an OEM-style inspection tool for use in any application requiring Class ZZ Plus plug gage verification at a 0.307-inch nominal bore diameter.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and inspection personnel. Before use, clean both the gage and the bore being checked to remove chips, coolant, and debris that could affect readings or damage the gage surface. Store the gage in its case when not in use to prevent nicks and corrosion. Periodic calibration against a certified master reference is recommended to maintain measurement integrity.