Spi 19-877-0 Class Zz Minus Plug Pin Gage 0.877 in

Product Description

The SPI 19-877-0 is a Class ZZ minus plug pin gage machined from steel, designed to check the minimum acceptable diameter of a drilled, reamed, or bored hole. At 0.877 inches in nominal diameter, this go/no-go style gage gives machinists and quality-control technicians a fast, reliable method for verifying that a hole falls within specification. The minus tolerance designation means the gage is ground to the lower boundary of the tolerance band, holding a tolerance of 0.0002 inches. This level of precision is standard for Class ZZ gages used in general inspection work on production floors, tool rooms, and fabrication shops.

This gage is suited for incoming inspection, in-process quality checks, and final verification of bored or drilled features in metal, plastic, and composite workpieces. It is a common tool in machine shops, manufacturing facilities, and precision fabrication environments where hole-size acceptance criteria must be documented and repeatable. Inspection technicians and machinists are the primary users of this type of gage.

Key Features

• Class ZZ tolerance class for general-purpose hole inspection
• Minus designation: ground to the lower limit of the tolerance band
• 0.0002 inches (0.0051 mm) tolerance for consistent, repeatable measurement
• 0.877 inches nominal diameter
• Steel construction for durability and dimensional stability
• Single-piece design with no adjustable components to drift or wear out of calibration

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general inspection of 0.877-inch nominal diameter holes in production, tool room, and quality-control applications.

Installation Notes

Plug pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store the gage in its protective case when not in use to avoid nicks or surface damage that can affect accuracy. Do not force the gage into a hole; if the gage does not pass through with light hand pressure, the hole is undersize. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity.