Spi 19-359-9 Class Zz Minus Plug Pin Gage 0.359 in

Product Description

The SPI 19-359-9 is a Class ZZ minus plug pin gage with a nominal diameter of 0.359 inches, manufactured from steel. It is a go/no-go style precision measurement tool used to verify hole diameters and bore tolerances to a minus tolerance of 0.0002 inches. This gage is a fundamental inspection instrument in machining, fabrication, and quality control environments where hole size conformance must be verified quickly and accurately. Machinists, quality technicians, and toolroom professionals reach for pin gages during in-process and final inspection of drilled, reamed, or punched features.

This gage is suited for use in production and inspection settings where tight dimensional control is required. Class ZZ is the most commonly used class for general-purpose inspection of hole diameters in standard manufacturing tolerances. It fits into standard gage handle sets for easy one-handed use at the machine or on an inspection table. The minus designation means the gage is manufactured to the lower boundary of the nominal size, making it appropriate for checking minimum acceptable hole dimensions.

Key Features

• Nominal diameter of 0.359 inches with a minus tolerance of 0.0002 inches for precise lower-boundary inspection
• Class ZZ classification suitable for general-purpose production inspection
• Steel construction for durability and wear resistance in shop environments
• Compatible with standard plug gage handles for convenient operation
• Compact and lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as an OEM-style replacement or standard addition for Class ZZ plug pin gage sets used in general-purpose hole inspection applications.

Installation Notes

Pin gages should be inserted and withdrawn from the bore without forcing or rotating under pressure to prevent wear on the gage surface. Clean both the gage and the workpiece bore before use to avoid false readings caused by debris or burrs. Store in a protective case away from moisture to maintain calibration and surface integrity. Periodic re-calibration against a certified master is recommended per your shop quality plan.