Spi 19-910-9 Class Zz Minus Plug Pin Gage 0.91 in Steel

Product Description

The SPI 19-910-9 is a Class ZZ minus plug pin gage machined from steel and used to verify bore diameters and hole tolerances in precision inspection and quality control work. Designed to a 0.91-inch nominal diameter with a tolerance of 0.0002 inches in the minus direction, this gage provides a reliable go/no-go reference for checking whether a drilled, reamed, or bored feature falls within specification. Class ZZ is the standard accuracy class for general-purpose inspection gages used in production and shop-floor environments. Machinists, tool-and-die makers, and quality technicians rely on plug pin gages like this one to confirm dimensional conformance before parts move to the next stage of manufacturing.

This gage is suited for production floor inspection, incoming material verification, and machine setup confirmation in metalworking, fabrication, and precision manufacturing environments. It is appropriate for both light industrial and high-volume production settings where consistent hole-size verification is required. The 0.91-inch diameter makes it applicable to a range of medium-bore applications commonly encountered in machined components, fixture work, and assembly inspection.

Key Features

• Class ZZ accuracy class for general-purpose production inspection
• Minus tolerance designation for go-gage and no-go-gage applications
• 0.0002-inch tolerance for precise dimensional verification
• Steel construction for durability and wear resistance in shop environments
• 0.91-inch nominal diameter covers a common medium-bore range

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional gage handle sets and pin gage holders sized for 0.91-inch diameter pins in general-purpose dimensional inspection applications.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians and do not require installation in the traditional sense. Clean the gage and the feature being measured before use to prevent contamination from affecting readings. Store the gage in a protective case away from other metal tools to prevent nicks or corrosion that could affect accuracy. Periodic calibration against a traceable standard is recommended to maintain measurement integrity over time.