Spi 19-779-8 Class Zz Minus Plug Pin Gage 0.7790 in

Product Description

The SPI 19-779-8 is a Class ZZ minus plug pin gage used to verify bore and hole diameters to a nominal size of 0.7790 inches. Built from steel, it provides a go/no-go reference point for dimensional inspection in manufacturing, machining, and quality control environments. The minus tolerance of 0.0002 inches ensures the gage falls within Class ZZ accuracy standards, making it suitable for general-purpose inspection where tight but not ultra-precision tolerances are required. Machinists, tool and die workers, and quality inspectors use plug pin gages as part of standard go/no-go gauge sets to confirm hole acceptance or rejection without the need for complex measuring instruments.

This gage is used in machine shops, production floors, and inspection departments where holes, bores, or drilled features must be verified against a nominal 0.7790-inch diameter. It fits into standard pin gage handles or handle sets and is appropriate for both incoming inspection of purchased parts and in-process quality checks. Steel construction holds up to repeated insertion cycles in typical shop environments.

Key Features

• Nominal diameter of 0.7790 inches for precise bore verification
• Class ZZ minus tolerance of 0.0002 inches meets general-purpose inspection standards
• Steel construction for durability through repeated use
• Designed for use in standard plug gage handle sets
• Lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as an OEM-style replacement or standard addition to Class ZZ plug pin gage sets used in general-purpose dimensional inspection applications.

Installation Notes

Plug pin gages are installed by pressing or sliding them into a compatible gage handle before use. Ensure the gage and the part being measured are at the same ambient temperature to avoid thermal expansion errors that can affect readings. Clean the bore and gage surfaces before each use to prevent debris from influencing results. Handle with care to avoid dropping, which can alter the gage geometry and compromise accuracy.