Spi 19-502-4 Class Zz Minus Plug Pin Gage 0.5020 in

Product Description

The SPI 19-502-4 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions to a nominal diameter of 0.5020 inches. It is a minus-tolerance gage, meaning its actual diameter is ground to the low side of the tolerance band, with a tolerance of 0.0002 inches. These single-end pin gages are standard inspection tools in machining, manufacturing, and quality-control environments. Technicians and machinists use them to confirm whether a drilled, reamed, or bored hole meets specified dimensional requirements before assembly or further machining proceeds.

Class ZZ plug gages are the general-purpose inspection grade, suitable for production-floor go/no-go verification of holes in metal and other rigid materials. The 0.5020-inch diameter makes this gage appropriate for checking holes at or near the 1/2-inch nominal range. It is commonly used in machine shops, toolrooms, and quality-assurance departments where dimensional verification of medium-tolerance bores is required. The steel construction provides the durability needed for repeated use in production environments.

Key Features

• Class ZZ minus tolerance ground to 0.0002 inches for production-grade inspection
• Nominal measurement diameter of 0.5020 inches
• Steel construction for durability and wear resistance in shop environments
• Single-end pin gage format for straightforward go/no-go hole checking
• Lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as an OEM-style replacement or standard addition to pin gage sets used for bore and hole inspection in general machining and quality-control applications at the 0.5020-inch diameter range.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, verify the gage and workpiece bore are at the same ambient temperature to avoid thermal expansion errors. Store the gage in a protective case away from other metal tools to prevent nicks or surface damage that could affect accuracy. Calibration and inspection should be performed by a qualified metrologist or quality-control technician in accordance with applicable shop standards.