Spi 29-685-5 Class Zz Plus Plug Gage 0.685 in

Product Description

The SPI 29-685-5 is a Class ZZ Plus plug gage designed for precision go/no-go inspection of drilled, reamed, or bored holes. It measures a nominal diameter of 0.685 inches with a tolerance of 0.0002 inches, making it suitable for close-tolerance quality control work in manufacturing, machining, and fabrication environments. The gage is constructed from steel for durability and dimensional stability. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one to verify that hole diameters fall within acceptable limits before parts advance through production.

This plug gage is intended for use in production inspection and incoming quality control settings where hole diameter verification is required. It is well suited for light manufacturing shops, job shops, and precision machining operations that need a reliable, single-dimension attribute gage. The 0.685-inch diameter covers a specific bore size commonly encountered in mechanical component production. The compact form factor and 0.2-pound weight make it easy to handle at the bench or on the shop floor.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for accurate attribute inspection
• Nominal measurement diameter of 0.685 inches
• Steel construction for wear resistance and dimensional stability
• Lightweight at 0.2 pounds for easy bench or floor use
• Single-piece design suited for go/no-go hole inspection workflows

Compatibility

Designed as a fixed-limit attribute gage for verifying 0.685-inch nominal hole diameters in steel, aluminum, and similar materials across standard machining and fabrication applications.

Installation Notes

Plug gages are handled and applied by machinists or quality control technicians and require no power or fastening. Before use, clean both the gage and the workpiece bore to remove chips, coolant, and debris that could affect the measurement. Apply only light hand pressure when inserting the gage to avoid scoring the gage or the bore surface. Store the gage in its case or protective holder when not in use to preserve its calibrated tolerance.