Spi 29-171-6 Class Zz Plus Plug Gage 0.171 in Steel

Product Description

The SPI 29-171-6 is a Class ZZ Plus plug gage used to verify hole and bore diameters to a nominal size of 0.171 inches. Manufactured from steel, this go/no-go style gage delivers a tolerance of 0.0002 inches, making it suitable for precision inspection work in machine shops, manufacturing facilities, and production environments. Metrology technicians and quality control inspectors use plug gages like this to confirm dimensional conformance during in-process or final inspection. The Class ZZ Plus designation reflects a defined tolerance grade appropriate for general-purpose gauging of production parts.

This plug gage is used in applications requiring accurate verification of small-diameter holes. It fits into quality inspection workflows for machined components, drilled passages, and precision assemblies where hole size must meet tight specifications. The 0.171-inch nominal diameter targets a specific size range common in precision metalworking and light manufacturing. Its compact size and steel construction make it practical for both bench and floor inspection use.

Key Features

• Nominal measurement diameter of 0.171 inches for precise hole verification
• Tolerance of 0.0002 inches meets Class ZZ Plus grade requirements
• Steel construction provides durability for repeated use in production environments
• Compact form factor suits bench inspection and in-line quality checks
• Single-piece packaging with a minimum order quantity of 1

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for inspection of 0.171-inch nominal diameter holes in machined parts and precision assemblies.

Installation Notes

Plug gages are handled and stored by metrology or quality control personnel, not installed in a mechanical system. Before use, clean both the gage and the workpiece bore with a lint-free cloth to remove debris, oils, or chips that could affect measurement accuracy. Apply light gage oil when appropriate to reduce wear on the gage surface. Follow your facility calibration schedule and handle the gage carefully to avoid dropping or contact with abrasive surfaces, which can alter the precision ground diameter.