Spi 29-250-8 Class Zz Plus Plug Gage 0.25 in Dia

Product Description

The SPI 29-250-8 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of machined holes and bores. It provides a go/no-go style check suited for inspection and quality control in machine shops, manufacturing facilities, and precision fabrication environments. The gage measures a nominal diameter of 0.25 inches with a tolerance of 0.0002 inches, making it appropriate for applications that demand close dimensional control. Constructed from steel for durability and wear resistance, this plug gage is handled by quality control technicians, machinists, and metrology professionals during in-process or final inspection routines.

This gage is used in precision measurement applications where hole diameter verification is required on machined parts, fixtures, or assemblies. It is well suited for light industrial and production environments that require repeatable, accurate inspection of 0.25-inch diameter features. The compact form factor and steel construction make it a practical addition to any inspection station or tool crib handling close-tolerance work.

Key Features

• Nominal measurement diameter of 0.25 inches for consistent hole verification
• Tight tolerance of 0.0002 inches supports precise dimensional inspection
• Steel construction provides durability and resistance to wear during repeated use
• Class ZZ Plus designation indicates conformance to recognized gage accuracy standards
• Compact and lightweight at 0.2 pounds for easy bench or portable use

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in precision hole inspection of machined components requiring a 0.25-inch nominal diameter measurement.

Installation Notes

Plug gages are handled by quality control technicians and machinists and require no permanent installation. Ensure the part or workpiece is secured and free of chips or debris before gaging. Store the gage in a protective case when not in use to prevent surface damage that could affect accuracy. Calibration intervals should follow applicable metrology standards for the inspection environment.