Spi 29-270-6 Class Zz Plus Plug Gage 0.27 Inch

Product Description

The SPI 29-270-6 is a Class ZZ Plus plug gage designed for precise go/no-go inspection of drilled, reamed, or bored holes with a nominal diameter of 0.27 inches. Built to Class ZZ Plus tolerance standards, this gage holds a tolerance of 0.0002 inches, making it suitable for production-floor inspection tasks where consistent hole sizing must be verified quickly and reliably. The steel construction provides durability under repeated use. Machinists, quality control technicians, and toolroom personnel use this type of gage as part of standard dimensional inspection workflows.

This plug gage is used in manufacturing and machining environments to verify that a hole falls within a specified dimensional range. It is appropriate for incoming inspection, in-process quality checks, and final part verification on ferrous and non-ferrous workpieces. The 0.27-inch diameter range covers a common hole size found in general machining, assembly, and fabrication applications.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for reliable go/no-go inspection
• 0.27-inch nominal measurement diameter suits common drilled and reamed hole sizes
• Steel construction for wear resistance and dimensional stability under shop conditions
• Compact and lightweight at 0.2 pounds for easy single-handed use
• Single-piece packaging — ready to use out of the box without additional assembly

Compatibility

Designed as a direct-use plug gage for go/no-go hole inspection at 0.27 inches nominal diameter, compatible with standard gage handle sets that accept this diameter range.

Installation Notes

Plug gages require no installation but should be handled and stored according to standard metrology practices. Always clean the gage and workpiece bore before gauging to prevent false readings or gage wear. Do not force the gage through an undersize hole, as this can damage the gage or the workpiece. Periodic re-calibration against a certified master is recommended to maintain measurement traceability.