Spi 19-444-9 Class Zz Minus Plug Pin Gage 0.444 in

Product Description

The SPI 19-444-9 is a Class ZZ minus plug pin gage machined from steel and used to verify hole diameters in precision measurement and quality control applications. It is designed to a nominal diameter of 0.444 inches with a minus tolerance of 0.000200 inches, confirming that a hole meets its minimum acceptable size. These gages are go/no-go inspection tools used on the shop floor, in tool rooms, and in receiving inspection. They are handled by machinists, metrology technicians, and quality control personnel working to tight dimensional tolerances.

Class ZZ plug gages are the standard choice for general-purpose production inspection where a cost-effective, reliable dimensional check is required. The 0.444-inch diameter makes this gage suitable for checking bored, drilled, or reamed holes in metal, plastic, and composite workpieces across light manufacturing, fabrication shops, and precision machining environments.

Key Features

• Nominal diameter of 0.444 inches for direct hole-size verification
• Class ZZ minus tolerance of 0.000200 inches for go-side inspection
• Steel construction for durability and dimensional stability in production use
• Compact single-piece design suited for hand use without additional tooling
• Consistent with ANSI class ZZ gage tolerance standards for general inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for verifying 0.444-inch nominal diameter holes in production inspection and quality assurance applications.

Installation Notes

Plug pin gages are handled by qualified metrology or quality control personnel and do not require installation in the traditional sense. Before use, clean both the gage and the hole being inspected to remove chips, coolant, and debris that could affect the reading. Avoid applying lateral force during insertion, as this can damage the gage or cause a false reading. Store the gage in its case or on a protected surface to prevent surface damage that would alter its calibrated diameter.