Spi 29-487-6 Class Zz Plus Plug Gage 0.487 in

Product Description

The SPI 29-487-6 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of machined holes and bores. It measures a nominal diameter of 0.487 inches with a tolerance of 0.0002 inches, providing the precision required for quality control checks in production and toolroom environments. Constructed from steel, this go/no-go style gage is a reliable tool for machinists and metrology technicians confirming part conformance to print. The compact form factor and light weight make it easy to handle during high-volume inspection work.

This plug gage is suited for use in manufacturing facilities, machine shops, toolrooms, and inspection departments where hole diameter verification is part of the production or QC process. It is appropriate for checking drilled, reamed, or bored holes in ferrous and non-ferrous workpieces. The Class ZZ Plus classification indicates a commercial-grade tolerance standard, making this gage a practical choice for production-floor go/no-go inspection rather than master or reference gage applications.

Key Features

• Nominal measurement diameter of 0.487 inches for precise hole verification
• Tolerance of 0.0002 inches meets Class ZZ Plus classification standards
• Steel construction provides durability and wear resistance under repeated use
• Lightweight at 0.2 pounds for easy single-hand operation during inspection
• Individual packaging protects the gage surface and maintains calibration integrity

Compatibility

Designed as a direct-use plug gage for inspecting machined holes with a nominal diameter of 0.487 inches in standard production and toolroom inspection applications.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and metrologists. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris, as contamination will produce false readings. Do not force the gage into a bore; firm hand pressure only is appropriate to avoid damaging the gage surface or the workpiece. Store the gage in its protective case when not in use to prevent surface wear and corrosion.