Spi 19-630-3 Class Zz Minus Plug Pin Gage 0.63 in Steel

Product Description

The SPI 19-630-3 is a Class ZZ minus plug pin gage used to verify hole diameters and bore tolerances in precision machining and quality control applications. It measures 0.63 inches in diameter and holds a tolerance of 0.0002 inches, conforming to Class ZZ specifications for minus-type go/no-go gauging. Constructed from steel, this gage is designed for use in shop-floor inspection and incoming material verification. Machinists, quality technicians, and toolroom professionals use plug gages like this to confirm that bored or drilled holes fall within acceptable dimensional limits.

This gage is suited for use in manufacturing environments where hole diameter verification is required to close tolerances. Typical applications include checking drilled, reamed, or bored holes in metal, plastic, or composite workpieces. The minus designation means the gage is made to the low side of the nominal diameter, which is standard for go-type plug gages used to confirm minimum acceptable hole size. It is commonly used in production inspection, first-article inspection, and tooling qualification.

Key Features

• 0.63 inch nominal diameter for direct hole size verification
• Class ZZ tolerance class rated at 0.0002 inches, suitable for general-purpose inspection
• Minus-type designation conforms to standard go-gage practice for minimum hole size checking
• Steel construction provides durability and wear resistance in shop environments
• Lightweight at 0.2 pounds for easy single-hand use during inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard go/no-go gauging setups where a 0.63 inch nominal diameter is required.

Installation Notes

Plug pin gages are used by quality technicians and machinists and require no installation in the traditional sense. Before use, clean the gage and the hole being inspected to remove chips, coolant, and debris that could affect the measurement. Handle the gage carefully to avoid dropping or striking it, as impact damage can alter the ground diameter and render the gage out of tolerance. Store the gage in a protective case away from other metal tooling to prevent surface wear.