Spi 19-447-2 Class Zz Minus Plug Pin Gage 0.447 in

Product Description

The SPI 19-447-2 is a Class ZZ minus plug pin gage with a nominal diameter of 0.447 inches, manufactured from steel. It is used to verify bore diameters and hole sizes by checking whether a machined feature meets its specified lower-limit tolerance. The minus designation means the gage is sized at the low end of the tolerance band, making it a go-gage reference in precision inspection workflows. With a tolerance of 0.0002 inches, this gage suits general-purpose dimensional inspection in manufacturing, maintenance, and quality-control environments. Machinists, toolmakers, and QC inspectors are the primary users.

This plug pin gage is used in production floor inspection, incoming quality checks, and fixture verification where a 0.447-inch nominal bore or hole feature must be confirmed within tight dimensional limits. It is suited for both ferrous and non-ferrous workpiece inspection. The compact, single-pin format allows use in tight clearances and is compatible with standard gage-handle holders commonly found in machine shops, maintenance facilities, and inspection labs.

Key Features

• Class ZZ tolerance class for general-purpose inspection work
• Minus designation provides lower-limit go-gage reference
• 0.0002 inches tolerance for accurate bore and hole verification
• Steel construction for durability in production environments
• 0.447-inch nominal diameter suits a common bore size range
• Single-pin format compatible with standard gage handles

Compatibility

Designed as a general-purpose plug pin gage for use in standard gage handle holders sized for 0.447-inch diameter gage pins. No specific model or system compatibility was stated in the product data.

Installation Notes

Plug pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Before use, clean both the gage pin and the workpiece bore with a lint-free cloth to remove chips, coolant, and debris. Never force a plug gage into a hole; excessive insertion force can damage the gage or the workpiece and will produce unreliable readings. Store the gage in its protective case when not in use to maintain calibration integrity.