Spi 29-024-7 Class Zz Plus Plug Gage 0.024 in Diameter

Product Description

The SPI 29-024-7 is a Class ZZ Plus plug gage designed for precision bore and hole diameter verification at 0.024 inches. Built from steel, this go/no-go style gage gives machinists, quality technicians, and tool-and-die professionals a reliable method for checking small-diameter features to a tolerance of 0.0002 inches. Class ZZ Plus designation indicates a tighter tolerance grade suited for inspection and production measurement where accuracy at the sub-thousandth level is required. The compact form factor and light weight of 0.2 pounds make it easy to handle during high-volume inspection routines.

This plug gage is used in machine shops, manufacturing facilities, and precision fabrication environments where small-bore diameter conformance must be verified against tight engineering tolerances. Typical applications include checking drilled, reamed, or machined holes in metal components. Quality control inspectors and CNC machinists routinely use Class ZZ plug gages to confirm feature dimensions before parts advance through the production process.

Key Features

• Nominal measurement diameter of 0.024 inches for small-bore inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus precision grade requirements
• Steel construction provides durability and dimensional stability during repeated use
• Lightweight at 0.2 pounds for comfortable single-hand operation
• Single-piece package quantity simplifies individual procurement and tool-crib stocking

Compatibility

Designed as an OEM-style precision measurement tool for use in standard plug gage handle holders compatible with 0.024-inch diameter Class ZZ plug gage blanks and pins.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store in a protective case away from other tooling to avoid nicking the gage surface. Before use, verify the gage is clean and free of debris that could affect measurement accuracy. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity over time.