Spi 29-502-2 Class Zz Plus Plug Gage 0.502 in

Product Description

The SPI 29-502-2 is a Class ZZ Plus plug gage designed to verify hole diameter accuracy in precision machining and inspection applications. This go/no-go style gage checks that a bored, drilled, or reamed hole falls within tolerance, giving machinists and quality control technicians a fast, reliable way to confirm conformance without measurement equipment setup. Built from steel, the 29-502-2 holds a tolerance of 0.0002 inches, making it appropriate for general-purpose inspection work where Class ZZ accuracy is specified. At 0.2 pounds, it is a lightweight, single-piece tool suited for bench and floor use.

This gage is used in machine shops, manufacturing facilities, and toolrooms where hole-diameter verification is part of routine inspection. It is sized for a nominal hole diameter of 0.502 inches and is well suited to applications involving close-tolerance drilling, reaming, or boring operations. Quality technicians, tool and die makers, and CNC machinists typically use plug gages of this class when verifying production parts against print tolerances.

Key Features

• Class ZZ Plus tolerance rating for general-purpose hole inspection
• 0.502-inch nominal diameter targets a common close-tolerance bore size
• 0.0002-inch tolerance provides consistent, repeatable pass/fail results
• Steel construction for durability in shop environments
• Lightweight at 0.2 pounds, easy to handle during inspection routines

Compatibility

Designed as a direct-use Class ZZ Plus plug gage for verifying 0.502-inch nominal hole diameters in standard machining and inspection applications.

Installation Notes

Plug gages require no installation but should be handled and stored carefully to prevent damage to the gaging surface. Clean the gage and the part bore before use to remove chips, coolant, or debris that could affect the measurement result. Allow both the gage and the workpiece to reach the same ambient temperature before inspection, as thermal variation can affect readings on close-tolerance work. Calibration and periodic re-certification by a qualified metrologist are recommended to maintain traceability.