Spi 19-145-2 Class Zz Minus Plug Pin Gage 0.145 in

Product Description

The SPI 19-145-2 is a Class ZZ minus plug pin gage machined from steel and used to verify hole diameters in precision machining and inspection work. Sized at 0.145 inches in diameter with a tolerance of 0.0002 inches, this gage is built to the Class ZZ standard, which is the most common tolerance grade for general-purpose go/no-go gauging in production environments. Machinists, quality control technicians, and tool-and-die professionals rely on pin gages like this one to confirm bore size compliance quickly and accurately without the need for complex measuring instruments.

This pin gage is suited for use in machine shops, fabrication facilities, and inspection departments where tight dimensional control is required. The minus designation means the gage is manufactured to the lower end of the nominal size tolerance, making it appropriate for checking minimum acceptable hole size in go-gage applications. It is a standard hand-held gage that integrates into conventional pin gage set workflows alongside a handle or gage block setup.

Key Features

• 0.145 inch nominal diameter for precise bore verification
• Class ZZ tolerance grade at 0.0002 inches for general-purpose inspection use
• Minus designation for lower-limit gauging applications
• Steel construction for durability and dimensional stability
• Single-piece design compatible with standard pin gage handles

Compatibility

Designed as an OEM-style replacement or direct addition to standard pin gage sets used in general-purpose dimensional inspection of 0.145 inch diameter bores.

Installation Notes

Pin gages are installed by hand into a compatible gage handle before use. Clean the gage and the bore being checked prior to gauging to prevent debris from affecting the reading. Store pin gages in a protective case or organizer to prevent damage to the gage surface, which can alter dimensional accuracy. Inspection procedures should follow applicable shop quality plans or ASME B89 gauging standards where required.