Spi 19-620-4 Class Zz Minus Plug Pin Gage 0.62 in

Product Description

The SPI 19-620-4 is a Class ZZ minus plug pin gage used to verify bore and hole dimensions in precision measurement and quality control applications. The gage measures 0.62 inches in diameter and is manufactured from steel, providing the hardness and dimensional stability required for repeatable inspection work. With a tolerance of 0.0002 inches, it meets Class ZZ specifications as defined by industry go/no-go gage standards. Machinists, tool and die technicians, and quality control inspectors use plug pin gages like this one to confirm that drilled, reamed, or bored holes fall within acceptable dimensional limits before parts move to assembly.

This gage is suited for shop floor inspection tasks across manufacturing, machining, and fabrication environments. It is commonly used in both job shop and production settings where hole diameter verification is required. The minus designation indicates the gage is ground to the minus tolerance of the Class ZZ specification, making it appropriate for checking the lower boundary of a hole tolerance range. It is a standard hand-tool-size gage that requires no power or calibration equipment to use at the point of inspection.

Key Features

• 0.62 inch diameter for direct hole and bore verification
• Class ZZ tolerance class with 0.0002 inch tolerance
• Minus designation for lower-boundary tolerance checking
• Steel construction for durability and dimensional stability
• Compact, handheld form factor for point-of-inspection use

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for any application requiring Class ZZ minus tolerance inspection of 0.62 inch diameter holes or bores.

Installation Notes

Plug pin gages are handled and used by machinists, quality technicians, and inspectors — no installation in the traditional sense is required. Store the gage in a protective case or holder when not in use to prevent surface damage that could affect dimensional accuracy. Do not force the gage into a hole; resistance indicates the hole is undersize. Clean and lightly oil the gage after use to prevent corrosion on the steel surface.