Spi 19-718-6 Class Zz Minus Plug Pin Gage 0.718 in

Product Description

The SPI 19-718-6 is a Class ZZ minus plug pin gage used to verify hole diameters and bore tolerances in precision machining and inspection applications. It is manufactured from steel and features a nominal diameter of 0.718 inches with a minus tolerance of 0.0002 inches. Class ZZ gages are the standard go/no-go inspection tool for checking whether a drilled, reamed, or bored hole falls within acceptable dimensional limits. This gage is handled by machinists, toolroom technicians, and quality control inspectors working in manufacturing, fabrication, and general metalworking environments.

This pin gage is suited for dimensional inspection of through holes and blind holes where tight diameter control is required. It is used during in-process checks and final inspection to confirm that hole sizes conform to engineering drawings and part tolerances. The 0.718 inch size fits into inspection routines for medium-range bore diameters common in structural components, machined housings, and assembly fixtures. Typical users include QC departments in job shops, production machining facilities, and maintenance shops requiring reliable, repeatable measurement tools.

Key Features

• Nominal diameter of 0.718 inches for medium-range bore inspection
• Class ZZ minus tolerance of 0.0002 inches for standard-grade go/no-go inspection
• Steel construction for durability and dimensional stability in shop environments
• Compact single-piece gage format for straightforward handheld use
• Designed for consistent, repeatable pass/fail hole diameter verification

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with 0.718 inch nominal diameter holes in general precision inspection and machining applications.

Installation Notes

Plug pin gages are used by machinists and quality control inspectors and require no installation tools. Before use, ensure the workpiece is secured and the bore to be checked is clean and free of burrs, chips, or coolant residue that could affect the measurement. Handle the gage carefully to avoid dropping or nicking the working surface, as any surface damage will compromise dimensional accuracy. Store in a protective case and periodically verify the gage against a calibrated standard to maintain measurement integrity.