Spi 29-127-8 Class Zz Plus Plug Gage 0.127 in Dia

Product Description

The SPI 29-127-8 is a Class ZZ Plus plug gage designed for precision dimensional inspection of small bores and holes. It measures a nominal diameter of 0.127 inches with a tolerance of 0.0002 inches, making it suitable for close-tolerance go/no-go verification in machining, manufacturing, and quality-control workflows. Constructed from steel, this gage provides the durability and dimensional stability required for repeated use on the production floor or in the inspection room. Machinists, tool-and-die makers, and quality technicians rely on plug gages of this class for verifying drilled, reamed, or broached hole diameters to specification.

Class ZZ Plus plug gages are typically used in manufacturing and industrial environments where hole diameter conformance must be confirmed quickly and accurately. This gage is suited for incoming inspection, in-process checks, and final part verification in shops working with tight-tolerance components. Its compact size and straightforward operation make it practical for bench use or integration into a standard gage-management program.

Key Features

• Nominal measurement diameter of 0.127 inches for precise small-bore inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus accuracy requirements
• Steel construction for dimensional stability and long service life
• Single-piece packaging suitable for individual inspection station use
• Compact form factor for bench-top or portable quality-control applications

Compatibility

Designed as an OEM-style Class ZZ Plus plug gage for use in standard go/no-go hole inspection applications requiring a 0.127-inch nominal diameter measurement.

Installation Notes

Plug gages should be handled and stored according to established metrology practices to prevent damage to the gage surface or alteration of its calibrated dimensions. Keep the gage clean and lightly oiled when not in use to prevent corrosion of the steel body. Do not force the gage into a bore; if resistance is felt, the hole is undersize and the gage should be withdrawn without applying additional pressure. Periodic calibration verification against a certified master is recommended to confirm gage accuracy over time.