Spi 29-191-4 Class Zz Plus Plug Gage 0.191 in

Product Description

The SPI 29-191-4 is a Class ZZ Plus plug gage designed for precision hole measurement in manufacturing and inspection environments. It measures bore diameters at 0.191 inches with a tolerance of 0.0002 inches, making it suitable for applications where tight dimensional control is required. The gage is constructed from steel for durability and consistent performance under repeated use. Machinists, quality control technicians, and tool room professionals use plug gages like this one to verify that drilled, reamed, or bored holes meet specified dimensional requirements before parts move to the next stage of production.

This plug gage is intended for use in precision inspection tasks on the shop floor or in a dedicated metrology area. Class ZZ Plus gages are typically used for production go/no-go inspection of hole diameters in machined components. The 0.191-inch size is commonly encountered in light manufacturing, fixture building, and general machining operations where small-diameter hole verification is part of the quality process.

Key Features

• 0.191-inch nominal diameter for precise small-bore measurement
• Class ZZ Plus tolerance rating at 0.0002 inches for reliable go/no-go inspection
• Steel construction for wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-piece package quantity for individual tooling procurement

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in go/no-go hole inspection applications requiring a 0.191-inch nominal diameter measurement.

Installation Notes

Plug gages are typically handled and used by quality technicians or machinists following standard metrology practices. Before use, clean the gage and the bore being checked to remove chips, coolant, or debris that could affect accuracy. Do not force the gage into a hole; excessive force can damage both the gage and the workpiece. Store the gage in a protective case away from other tools to prevent surface damage and maintain calibration integrity.