Spi 29-146-8 Class Zz Plus Plug Gage 0.146 in

Product Description

The SPI 29-146-8 is a Class ZZ Plus plug gage used to verify the diameter of precision bored holes and machined openings. It measures a nominal diameter of 0.146 inches with a tolerance of 0.0002 inches, providing reliable go/no-go inspection capability for tight-tolerance work. The gage is constructed from steel for consistent dimensional stability under shop conditions. Machinists, quality control technicians, and toolroom professionals use plug gages like this one during in-process and final inspection of drilled, reamed, or bored features.

This gage is suited for use in precision machining environments where hole diameter conformance must be verified against a defined tolerance. Typical applications include inspection of small-diameter holes in metal components, fixture verification, and tooling qualification. The compact size and light weight make it practical for bench inspection as well as point-of-operation checks on manual or CNC machining equipment.

Key Features

• Class ZZ Plus tolerance class for standard-grade hole inspection
• Nominal measurement diameter of 0.146 inches
• Tolerance of 0.0002 inches for precise dimensional verification
• Steel construction for dimensional stability and durability
• Lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as a standard plug gage for verifying 0.146-inch nominal diameter holes in precision-machined components across metalworking and manufacturing applications.

Installation Notes

Plug gages are handled by quality control and machining professionals during inspection procedures. Clean the gage and the hole to be measured before use to prevent debris from affecting readings. Do not force the gage into an undersized hole, as this can damage the gage or the workpiece. Store the gage in a protective case away from other tooling to prevent nicking or surface damage that would compromise accuracy.