Spi 19-747-5 Class Zz Minus Plug Pin Gage 0.747 in Dia

Product Description

The SPI 19-747-5 is a Class ZZ minus plug pin gage with a 0.747-inch nominal diameter, designed for go/no-go dimensional inspection of bores, holes, and machined features. Manufactured from steel, this pin gage holds a minus tolerance of 0.0002 inches, meaning the actual diameter is ground slightly below nominal to function as the go member in a tolerance stack. Machinists, quality technicians, and tool-and-die professionals use Class ZZ pin gages for production-floor inspection and incoming-parts verification where traceable dimensional accuracy is required.

Class ZZ minus plug pin gages are suited for general-purpose inspection in manufacturing, fabrication, and machine shops. This gage is used to verify bore diameter conformance on drilled, reamed, or bored features in both small-batch and production environments. The 0.747-inch diameter makes it applicable to a specific range of medium-diameter hole checks where hand gaging or CMM verification is impractical for high-volume part flow.

Key Features

• Class ZZ tolerance classification for general-purpose production inspection
• Minus-type grind: actual diameter is at or below 0.747 inches within the 0.0002-inch tolerance band
• Steel construction for durability and dimensional stability during repeated use
• Single-piece pin format for straightforward manual bore checking
• Lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible pin gage handles and holders sized for 0.747-inch diameter pins in general machining and inspection applications.

Installation Notes

Pin gages should be handled with clean cotton or nitrile gloves to prevent skin oils from affecting surface dimensions and promoting corrosion. Insert the pin gage into the bore with light, controlled hand pressure only — never force a pin gage with tools or mallets. Store in a protective case when not in use to prevent nicking or wear on the ground surface. Verify calibration status before use in applications requiring traceable inspection records.