Spi 29-939-6 Class Zz Plus Plug Gage 0.939 in

Product Description

The SPI 29-939-6 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a precise tolerance. It measures 0.939 inches in diameter with a tolerance of 0.0002 inches, making it suitable for quality control and inspection applications where consistent dimensional accuracy is required. The gage is constructed from steel for durability under repeated use. Machinists, toolroom technicians, and quality inspection personnel use plug gages like this one to confirm whether a bore falls within acceptable dimensional limits during production or incoming inspection.

This plug gage is used in manufacturing, machining, and precision inspection environments. It is appropriate for checking holes and bores in metal components where tight tolerances must be confirmed. Class ZZ Plus gages are typically used in production settings where high-volume inspection of drilled, reamed, or bored holes is performed. The 0.939-inch diameter size fits a specific range of bore applications common in industrial and mechanical assemblies.

Key Features

• 0.939-inch measurement diameter for precise bore inspection
• Class ZZ Plus tolerance class rated at 0.0002 inches
• Steel construction for wear resistance and dimensional stability
• Single-piece plug gage format for straightforward go/no-go inspection use
• Compact and lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as a direct-use plug gage for inspecting bores and holes with a nominal diameter of 0.939 inches in machined components and assemblies.

Installation Notes

Plug gages are handled and used by quality technicians and machinists and do not require installation in the traditional sense. Before use, ensure the gage and the workpiece bore are clean and free of chips, coolant, or debris that could affect measurement accuracy. Do not force the gage into a bore, as this can damage the gage surface and compromise calibration. Gages should be stored properly and recalibrated on a regular schedule per your facility inspection standards.