Spi 19-057-9 Class Zz Minus Plug Pin Gage 0.057 in

Product Description

The SPI 19-057-9 is a Class ZZ minus plug pin gage machined to a 0.057-inch nominal diameter with a minus tolerance of 0.0002 inches. Plug pin gages are used to verify hole diameters and feature sizes in machined parts, castings, and fabricated components. This gage is constructed from steel for durability and dimensional stability under repeated use. Class ZZ is the standard commercial tolerance class for go/no-go inspection in general manufacturing and quality control applications. Machinists, quality control technicians, and tool-and-die professionals use plug gages as a fast, reliable method for in-process and final inspection.

This gage is suited for shop-floor and inspection-room use where small-diameter hole verification is required. The 0.057-inch size is commonly encountered in applications involving drilled, reamed, or punched holes in light manufacturing, precision machining, and metal fabrication. A minus designation means the gage diameter is ground to the low side of the nominal, which is standard practice for go-gage members in a go/no-go pair. It is appropriate for use in any environment requiring consistent dimensional verification of small bores.

Key Features

• Class ZZ tolerance class for general commercial go/no-go inspection
• Minus designation: diameter ground to the low side of nominal
• 0.0002-inch tolerance for reliable dimensional verification
• Steel construction for wear resistance and long service life
• 0.057-inch nominal diameter for small-bore inspection applications

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for inspection setups requiring a 0.057-inch Class ZZ minus gage member in standard go/no-go gage handle systems.

Installation Notes

Plug pin gages are installed by hand into a compatible gage handle or used directly as a pin gage. Clean the gage and the feature being inspected before use to prevent debris from affecting readings. Store the gage in a protective case away from other metal tools to avoid nicking or scratching the precision ground surface. Periodic recalibration against a certified master is recommended to maintain measurement traceability.