Spi 29-243-3 Class Zz Plus Plug Gage 0.243 in Dia

Product Description

The SPI 29-243-3 is a Class ZZ Plus plug gage designed to verify hole diameters to a nominal size of 0.243 inches with a tolerance of 0.0002 inches. Plug gages are go/no-go precision inspection tools used to confirm that a drilled, reamed, or bored hole falls within an acceptable dimensional range. The steel construction provides durability for repeated use on the shop floor or in a quality-control environment. Machinists, toolmakers, and QC inspectors rely on Class ZZ Plus gages for general-purpose hole inspection where close tolerances must be verified quickly and reliably.

This plug gage is suited for use in manufacturing, machine shops, tool rooms, and production inspection settings. It applies wherever a 0.243-inch nominal hole diameter must be checked against a defined tolerance, including work on fixtures, jigs, drilled components, and precision assemblies. The compact form factor and light weight make it easy to handle during high-volume inspection cycles or bench work.

Key Features

• Nominal measurement diameter of 0.243 inches for precise hole verification
• Class ZZ Plus tolerance rating of 0.0002 inches for general-purpose inspection
• Steel construction for wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Go/no-go design allows rapid pass-fail inspection without additional instruments

Compatibility

Designed as a general-purpose go/no-go inspection gage for any application requiring verification of a 0.243-inch nominal hole diameter to Class ZZ Plus standards.

Installation Notes

Plug gages are inspection tools, not cutting tools — they should never be forced into a hole. Insert the gage by hand with light axial pressure only; resistance indicates the hole is undersize or contains burrs that must be removed before re-inspection. Store the gage in a protective case away from other metal tooling to prevent damage to the precision ground surface. Calibration and periodic comparison against certified masters is recommended to maintain traceable accuracy.