Spi 19-254-2 Class Zz Minus Plug Pin Gage 0.254 in

Product Description

The SPI 19-254-2 is a Class ZZ minus plug pin gage machined to a nominal diameter of 0.254 inches with a tolerance of 0.0002 inches. Plug pin gages are precision measurement tools used to verify hole diameters and bore sizes in machined components, castings, and fabricated parts. The minus designation means the gage is ground to the low side of the tolerance, making it suitable for go/no-go inspection workflows where maintaining dimensional accuracy is critical. The steel construction provides the hardness and wear resistance required for repeated use in shop-floor quality control applications. Machinists, tool-and-die makers, and QC inspectors rely on this class of gage for fast, repeatable hole verification.

This pin gage is suited for inspection of precision-drilled, reamed, or bored holes in manufacturing and machining environments. Class ZZ gages are typically used in production settings where a cost-effective, functional-grade gage is appropriate rather than a master-grade reference standard. The 0.254-inch diameter fits a specific range of hole checks common in general metalworking, fixture assembly, and component inspection. It is sold as a single gage, making it easy to source as a replacement for a worn or lost pin within an existing gage set.

Key Features

• Nominal diameter of 0.254 inches for precise hole inspection
• Class ZZ tolerance grade with a minus designation ground to the low side of tolerance
• Tolerance of 0.0002 inches for reliable dimensional verification
• Steel construction provides hardness and durability for repeated shop-floor use
• Sold individually — convenient as a single replacement within a larger pin gage set

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general metalworking, machining, and quality control inspection applications requiring verification of 0.254-inch diameter holes.

Installation Notes

Pin gages are handled and stored by metrology technicians, machinists, and QC personnel following standard gage-handling practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel surface. Do not force the gage into a hole; controlled hand pressure is the correct method for go/no-go checks. Calibrate and re-verify gages periodically in accordance with your facility quality management procedures.