Spi 29-061-9 Class Zz Plus Plug Gage 0.061 in

Product Description

The SPI 29-061-9 is a Class ZZ Plus plug gage used to verify the diameter of small bores and holes to a high degree of accuracy. It is machined from steel and measures a nominal diameter of 0.061 inches with a tolerance of 0.0002 inches. Class ZZ Plus gages are single-end GO or NO-GO tools used in precision inspection and quality control environments. Machinists, tool-and-die makers, and quality technicians rely on this type of gage to confirm that drilled, reamed, or punched holes fall within specified dimensional tolerances before parts move to the next stage of production.

This plug gage is suited for inspection of small-diameter holes in machined components, stamped parts, and assemblies where tight dimensional control is required. It is commonly used on the shop floor and in inspection rooms across manufacturing, metalworking, and precision fabrication settings. The compact size and light weight make it practical for repeated use at a workbench or inline at a machining center.

Key Features

• Nominal measurement diameter of 0.061 inches for small-bore inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus accuracy requirements
• Steel construction for durability and dimensional stability
• Lightweight at 0.2 pounds for easy single-hand use during inspection
• Single package quantity supports individual or low-volume inspection needs

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in any inspection or quality control application requiring verification of 0.061-inch nominal bore diameters.

Installation Notes

Plug gages are handled and applied by machinists, quality technicians, and inspection personnel — no power tools or trade licensing is required. Before use, clean the gage and the workpiece bore thoroughly to remove chips, oil, or debris that could affect the reading. Never force a plug gage into a bore; improper force can damage the gage or the part. Store the gage in its case or protective sleeve when not in use to preserve the ground surface and prevent corrosion.