Spi 19-890-3 Class Zz Minus Plug Pin Gage 0.89 in

Product Description

The SPI 19-890-3 is a Class ZZ minus plug pin gage machined for precision bore and hole inspection in industrial and trade settings. Designed to a nominal diameter of 0.89 inches with a tolerance of 0.0002 inches, this gage provides a reliable go/no-go reference for quality control checks on machined components, castings, and fabricated assemblies. Constructed from steel for durability and dimensional stability, it is suited for use in manufacturing, tool and die, and mechanical service environments where accurate hole measurement is required. Machinists, quality technicians, and precision tradespeople are the typical end users.

This plug gage is used wherever a 0.89-inch nominal bore or hole diameter must be verified against a minus-tolerance Class ZZ standard. Class ZZ gages are commonly applied in less critical or general inspection applications where tight gage tolerances are not required. Typical installation scenarios include incoming inspection, in-process quality checks on drill press and CNC-machined parts, and verification of hole acceptance criteria in light manufacturing and repair shop environments.

Key Features

• Class ZZ minus tolerance designation for general-purpose bore and hole inspection
• Nominal diameter of 0.89 inches for direct measurement reference
• Tolerance of 0.0002 inches for repeatable, consistent gage readings
• Steel construction for dimensional stability and wear resistance under regular use
• Single-piece package quantity suitable for individual bench or field use

Compatibility

Designed as an OEM-style precision measurement tool for use in general inspection applications requiring a 0.89-inch nominal diameter Class ZZ minus plug gage standard.

Installation Notes

Plug pin gages are typically handled by machinists or quality control technicians and require no installation in the traditional sense. Clean the gage and the bore being checked before use to avoid contamination affecting measurement accuracy. Store the gage in its protective case when not in use to prevent nicks or corrosion that could alter the ground surface diameter. Refer to applicable ASME B89.1.5 gage standards for proper handling and calibration interval guidance.