Spi 19-457-1 Class Zz Minus Plug Pin Gage 0.457 in

Product Description

The SPI 19-457-1 is a Class ZZ minus plug pin gage machined to a 0.457-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision measurement tools used to verify hole diameters and bore sizes by checking whether a workpiece feature accepts or rejects the gage pin. The minus designation means the pin is ground to the lower end of the tolerance range, making it suitable for go-gage applications where confirming minimum acceptable hole size is the objective. Constructed from steel, this gage is a standard hand tool found in machine shops, quality control environments, and fabrication facilities.

This gage is used in dimensional inspection workflows where tight hole tolerances must be verified quickly and reliably. Common applications include checking drilled, reamed, or bored holes in metal and plastic workpieces during in-process inspection or final quality control checks. The 0.457-inch diameter targets mid-range hole sizes encountered in general precision machining and manufacturing environments. Machinists, QC technicians, and tool-and-die professionals are the primary users of this type of gage.

Key Features

• Class ZZ tolerance grade suitable for go-gage and inspection applications
• Minus designation ground to the lower tolerance boundary for accurate go-gage use
• 0.0002-inch tolerance provides precise dimensional verification
• Steel construction for durability in shop and inspection room environments
• 0.457-inch nominal diameter for mid-range bore and hole inspection

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible gage handle sets in dimensional inspection applications requiring a 0.457-inch nominal diameter pin.

Installation Notes

Plug pin gages should be inserted into the workpiece bore with light, controlled hand pressure only — never forced. Clean the gage and workpiece bore before use to prevent debris from affecting the reading or damaging the gage surface. Store pin gages in a protective case away from contact with other tools to preserve the ground surface finish and dimensional integrity. Gages should be recalibrated periodically according to your quality management system requirements.