Spi 19-909-1 Class Zz Minus Plug Pin Gage 0.909 in

Product Description

The SPI 19-909-1 is a Class ZZ minus plug pin gage machined from steel for dimensional inspection and go/no-go gauging applications. It measures 0.909 inches in diameter with a minus tolerance of 0.000200 inches, placing it squarely in the Class ZZ accuracy range used for general-purpose production inspection. Machinists, quality control technicians, and tool and die professionals use plug gages like this one to verify bore diameters quickly and repeatably on the shop floor or in the inspection room. The steel construction provides durability through repeated use in standard industrial environments.

This gage is suited for checking 0.909-inch nominal bores in machined components, castings, and fabricated parts during incoming inspection, in-process gauging, or final quality verification. Class ZZ is the most common grade for general manufacturing tolerances where high-precision master-grade accuracy is not required. It is a standard single-ended pin gage appropriate for bench use or handheld inspection in production settings.

Key Features

• 0.909-inch diameter for direct bore inspection at that nominal size
• Class ZZ minus tolerance of 0.000200 inches for general-purpose gauging
• Steel construction for wear resistance and dimensional stability
• Single-piece pin gage design for straightforward handheld use
• Suitable for go/no-go inspection workflows in production environments

Compatibility

Designed as a general-purpose replacement or addition to standard plug gage sets for inspecting 0.909-inch nominal bore features in machined parts across typical manufacturing and inspection applications.

Installation Notes

Plug pin gages are handled by quality control technicians and machinists and require no installation in the traditional sense. Before use, clean the gage and the bore being inspected to remove chips, coolant, and debris that could affect measurement accuracy. Store the gage in a protective case away from other metal tools to prevent nicking the gage surface. Follow your facility calibration schedule and handle with care to preserve the tolerance class rating.