Spi 29-253-2 Class Zz Plus Plug Gage 0.253 in Dia

Product Description

The SPI 29-253-2 is a Class ZZ Plus plug gage designed to verify the internal diameter of precision bored holes, drilled passages, and machined features. It measures a nominal diameter of 0.2530 inches with a tolerance of 0.0002 inches, providing reliable go/no-go inspection capability for production and quality-control applications. Constructed from steel, the gage resists wear under repeated use in shop environments. Machinists, tool-and-die makers, and quality technicians use plug gages like this one to confirm that a finished bore meets drawing tolerances before assembly or further machining proceeds.

This gage is suited for inspection tasks in machine shops, manufacturing cells, and fabrication facilities where tight-tolerance hole verification is required. The 0.2530-inch diameter targets common small-bore applications found across general metalworking and precision component manufacturing. Its compact size makes it easy to handle during high-volume part runs or single-piece inspection work alike.

Key Features

• Class ZZ Plus tolerance rating for accurate go/no-go hole inspection
• 0.2530-inch nominal measurement diameter
• 0.0002-inch tolerance for tight-tolerance bore verification
• Steel construction for durability and wear resistance in production environments
• Compact form factor suited to small-bore inspection tasks

Compatibility

Designed as a standard Class ZZ Plus plug gage for verifying 0.2530-inch nominal diameter bores in metalworking and precision machining applications.

Installation Notes

Plug gages are handled and inspected by qualified machinists or quality-control personnel. Clean the gage and the bore thoroughly before use to prevent debris from affecting the measurement result. Store the gage in its protective case when not in use to prevent damage to the precision ground surface. Do not force the gage into an undersized bore, as this will damage the gage and invalidate future measurements.