Spi 19-503-2 Class Zz Minus Plug Pin Gage 0.503 in

Product Description

The SPI 19-503-2 is a Class ZZ minus plug pin gage machined to a 0.503-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision hand tools used to verify bore and hole dimensions by checking whether a feature accepts or rejects the gage pin. Class ZZ is the standard inspection-grade tolerance class for general-purpose go/no-go gauging in production and quality-control environments. The minus designation means the gage is ground to the lower boundary of the tolerance band, making it suitable as a go-member check. The body is machined from steel for dimensional stability and resistance to wear during repeated use.

This pin gage is used in machine shops, manufacturing facilities, and precision inspection stations where hole diameter verification is required. It is appropriate for incoming inspection, in-process quality checks, and final acceptance gauging of drilled, reamed, or bored features. Machinists, quality technicians, and tool-and-die professionals routinely use Class ZZ pin gages to confirm dimensional compliance to print tolerances in both low-volume job-shop and high-volume production settings.

Key Features

• 0.503-inch nominal diameter for direct bore verification at that dimension
• Class ZZ tolerance class suitable for general-purpose production gauging
• Minus designation ground to the lower tolerance boundary for go-member applications
• 0.0002-inch tolerance for reliable dimensional control
• Steel construction provides durability and resistance to wear over repeated use cycles

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with any pin gage handle or collet holder accepting 0.503-inch diameter gage pins in general-purpose dimensional inspection applications.

Installation Notes

Pin gages should be handled with clean, dry hands or inspection gloves to prevent corrosion and dimensional error from skin oils and debris. Before use, inspect the gage surface for nicks, burrs, or wear that could affect measurement accuracy. Store the gage in a protected case away from other metal tools to avoid surface damage. Calibration against a traceable standard is recommended at regular intervals to maintain measurement integrity.