Spi 19-520-6 Class Zz Minus Plug Pin Gage 0.52 in Steel

Product Description

The SPI 19-520-6 is a Class ZZ minus plug pin gage designed for dimensional inspection and go/no-go gauging applications. With a nominal diameter of 0.52 inches and a tolerance of 0.0002 inches (minus), this gage allows machinists, quality technicians, and toolroom professionals to verify bore and hole dimensions with a high degree of accuracy. Constructed from steel, the 19-520-6 delivers the rigidity and wear resistance required for repetitive inspection work on the shop floor or in a quality lab environment.

This plug pin gage is suited for use in manufacturing, machining, and quality control settings where close-tolerance hole verification is required. Class ZZ gages are typically used for production inspection of internal dimensions such as drilled, reamed, or bored holes. The minus designation indicates the gage is manufactured to the lower tolerance boundary, ensuring it functions as a reliable go-gage reference for the specified nominal size.

Key Features

• Nominal diameter of 0.52 inches for precise hole and bore inspection
• Class ZZ tolerance classification suitable for production-level gauging
• Minus tolerance designation at 0.0002 inches for consistent go-gage performance
• Steel construction for durability and dimensional stability under repeated use
• Lightweight at 0.2 pounds for easy single-hand handling during inspection

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for applications requiring Class ZZ inspection tooling at a 0.52-inch nominal bore diameter.

Installation Notes

Plug pin gages are handled and used by quality technicians and machining professionals. Before use, clean the gage and the workpiece bore of chips, coolant, and debris to ensure accurate readings. Do not force the gage into a bore; excessive insertion force can damage the gage surface and produce false readings. Store the gage in a protective case away from heat sources and corrosive environments to preserve dimensional integrity.