Spi 19-559-4 Class Zz Minus Plug Pin Gage 0.559 in

Product Description

The SPI 19-559-4 is a Class ZZ minus plug pin gage machined to a 0.559-inch nominal diameter with a minus tolerance of 0.0002 inches. Plug pin gages are go/no-go style inspection tools used to verify hole diameters and bore sizes against a specified tolerance. Class ZZ represents the most commonly specified tolerance class for shop-floor and general-purpose inspection work. This gage is made from steel and is handled daily by machinists, quality control technicians, and toolroom personnel who need a reliable, traceable method for dimensional verification of drilled, reamed, or bored features.

This gage is suited for general machining and manufacturing environments where hole-diameter conformance is checked against a defined tolerance. Typical applications include verifying bores in machined components, checking drilled holes in fabricated parts, and auditing tooling during production runs. The 0.559-inch size fits a range of common bore diameters encountered in light and medium manufacturing. Both job shops and production facilities use this type of gage as part of routine in-process and final inspection workflows.

Key Features

• Class ZZ tolerance class — standard grade for general shop-floor inspection use
• Minus tolerance configuration of 0.0002 inches for precise lower-limit gauging
• 0.559-inch nominal diameter covers a commonly specified bore size
• Steel construction provides durability for repeated handling in shop environments
• Single-piece packaging supports individual replacement or addition to an existing gage set

Compatibility

Designed as a standard Class ZZ minus plug pin gage suitable for use with conventional gage handle sets and pin gage holders sized for 0.559-inch diameter pins.

Installation Notes

Plug pin gages are handled by metrology and quality control personnel and do not require tools for use. Store gages in a protective case away from moisture and abrasive surfaces to preserve the ground finish and dimensional integrity. Clean the gage and the bore being measured before use to prevent debris from affecting the reading. Calibration intervals should follow the facility quality plan or applicable standards such as ASME B89.1.5.