Spi 19-493-6 Class Zz Minus Plug Pin Gage 0.493 in

Product Description

The SPI 19-493-6 is a Class ZZ minus plug pin gage ground to a nominal diameter of 0.493 inches with a minus tolerance of 0.0002 inches. Pin gages are used to verify hole diameters, slot widths, and feature locations to a known standard. This gage is manufactured from steel for durability and dimensional stability during repeated use. Class ZZ designates the standard commercial-grade tolerance class suitable for general inspection work, part sorting, and go/no-go functional checks in production and maintenance environments. Machinists, quality technicians, and tool-and-die professionals use pin gages as part of routine dimensional verification procedures.

This gage is suited for shop-floor inspection and quality control applications where a 0.493-inch nominal diameter feature must be verified. It is appropriate for use in manufacturing, fabrication, and maintenance shops working to inch-based tolerances. The minus designation means the gage is ground below nominal, making it suitable for go-gage applications where a passing hole must accept the pin. Typical use cases include incoming inspection, in-process verification, and fixture qualification.

Key Features

• Nominal diameter of 0.493 inches for direct feature verification
• Class ZZ tolerance classification for general commercial inspection use
• Minus tolerance of 0.0002 inches ground below nominal for go-gage applications
• Steel construction for wear resistance and dimensional stability
• Single-piece design for simple, repeatable hand-held use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with any 0.493-inch nominal diameter bore, hole, or slot inspection application using inch-based measurement standards.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store the gage in its protective sleeve or case when not in use to prevent damage to the ground surface. Do not force the gage into a hole; apply only light, consistent hand pressure to avoid deflection or surface damage. Periodic cleaning and inspection for wear or nicks is recommended to maintain measurement integrity.