Spi 29-189-8 Class Zz Plus Plug Gage 0.189 in Dia

Product Description

The SPI 29-189-8 is a Class ZZ Plus plug gage used to verify the diameter of machined holes to a high degree of accuracy. It measures holes with a nominal diameter of 0.189 inches and holds a tolerance of 0.0002 inches, making it appropriate for go/no-go inspection work in precision machining and manufacturing environments. The gage body is constructed of steel for durability and dimensional stability under normal shop conditions. Machinists, tool and die makers, and quality control inspectors use this type of gage as part of standard dimensional inspection procedures.

This plug gage is suited for use in machine shops, toolrooms, and production floor inspection stations where hole diameter verification is required. It is typically used to confirm bore size on drilled, reamed, or bored holes during in-process or final inspection. The compact form factor and single-diameter design make it straightforward to apply in both high-volume production and low-volume precision work environments.

Key Features

• Nominal measurement diameter of 0.189 inches for targeted hole inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus accuracy requirements
• Steel construction provides wear resistance and dimensional stability
• Single-piece plug gage design for fast, repeatable go/no-go checks
• Lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring go/no-go hole inspection at a nominal diameter of 0.189 inches under Class ZZ Plus tolerance standards.

Installation Notes

Plug gages are handled and used by machinists and quality technicians following standard dimensional inspection procedures. Clean the gage and the bore being measured before use to prevent debris from affecting readings. Store the gage in a protective case when not in use to prevent surface damage that could affect accuracy. Periodic recalibration against certified masters is recommended to maintain traceability to measurement standards.