Spi 29-019-7 Class Zz Plus Plug Gage 0.019 in

Product Description

The SPI 29-019-7 is a Class ZZ Plus plug gage designed for precision hole diameter verification in manufacturing and inspection environments. With a measurement diameter of 0.019 inches and a tolerance of 0.0002 inches, this gage is built for applications where tight dimensional control is required. Constructed from steel, it delivers the durability and wear resistance expected in production toolroom and quality-control settings. Machinists, toolmakers, and metrology technicians use plug gages like this to confirm that drilled, reamed, or punched holes fall within specified limits before parts advance to the next stage of production.

This gage is suited for use in precision machining shops, toolrooms, and inspection departments working with small-diameter holes. The 0.019-inch nominal diameter places it in the micro-diameter range, making it appropriate for delicate workpieces, watch components, instrument parts, and similar fine-tolerance assemblies. It is a go or no-go style reference tool used during in-process inspection or final part acceptance.

Key Features

• Measurement diameter: 0.019 inches for micro-diameter hole inspection
• Tolerance: 0.0002 inches, meeting Class ZZ Plus accuracy requirements
• Steel construction for wear resistance and dimensional stability
• Compact, single-unit packaging suitable for individual toolroom use
• Class ZZ Plus rating appropriate for production and general inspection gaging

Compatibility

Designed as a standard plug gage for verifying 0.019-inch nominal diameter holes in steel, aluminum, and similar workpiece materials across precision machining and inspection applications.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality technicians. Clean the gage and the workpiece bore before use to prevent debris from causing false readings or premature wear. Store the gage in a protective case away from other tooling to avoid surface damage. Do not force the gage into a hole; if resistance is encountered, the hole is undersize and should be reworked before re-inspection.