Spi 19-894-5 Class Zz Minus Plug Pin Gage 0.894 in

Product Description

The SPI 19-894-5 is a Class ZZ minus plug pin gage ground to a nominal diameter of 0.894 inches with a minus tolerance of 0.0002 inches. Plug pin gages are precision measurement tools used to verify bore and hole diameters to a known tolerance class. The Class ZZ designation indicates a standard commercial-grade tolerance suitable for production inspection and general shop-floor measurement work. Constructed from steel, this gage provides the dimensional stability and wear resistance required for repeated use in quality control applications. Machinists, toolmakers, and quality inspection technicians are the primary users of this type of gage.

This plug pin gage is suited for production environments where hole diameter acceptance or rejection must be confirmed quickly and reliably. It is used in machine shops, manufacturing facilities, and assembly operations to inspect drilled, reamed, or bored holes. The minus configuration means the gage is ground below the nominal diameter, making it a go-gage check tool for confirming minimum acceptable hole size. The 0.894-inch nominal size fits within a range of common bore inspection tasks encountered in general metalworking and precision part manufacturing.

Key Features

• Class ZZ minus tolerance of 0.0002 inches for standard commercial-grade inspection work
• Nominal diameter of 0.894 inches for bore and hole verification
• Steel construction for dimensional stability and wear resistance
• Single-ended plug gage format for straightforward go or no-go inspection use
• Lightweight at 0.2 pounds for easy one-handed handling during inspection

Compatibility

Designed as a standard plug pin gage replacement or addition for quality inspection setups requiring a 0.894-inch nominal diameter Class ZZ minus gage in steel.

Installation Notes

Plug pin gages do not require installation in the conventional sense but must be handled and stored with care to preserve accuracy. Clean the gage and the bore being inspected before use to prevent debris from affecting the measurement. Never force a plug gage into a hole; if resistance is felt, stop and assess the bore condition. Store the gage in a protective case away from other tooling to prevent nicks or corrosion that could affect the ground diameter.