Spi 29-540-2 Class Zz Plus Plug Gage 0.54 in Diameter

Product Description

The SPI 29-540-2 is a Class ZZ Plus plug gage designed for precision hole measurement in machining and quality control applications. It measures bore diameters at 0.54 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection routines where tight dimensional verification is required. Constructed from steel for durability and dimensional stability, this plug gage is a standard tool in production floor inspection, machine shops, and metrology labs. Machinists, quality technicians, and tool-and-die professionals rely on Class ZZ gages for routine hole verification during and after machining operations.

This plug gage is suited for use in light manufacturing, precision machining, and inspection environments where accurate bore measurement at 0.54 inches is needed. It fits into standard go/no-go gage workflows for incoming inspection, in-process checking, and final part verification. The compact form factor and steel construction make it practical for bench-top and floor-level inspection tasks in both job shop and production settings.

Key Features

• Measures bore diameter at 0.54 inches with a 0.0002-inch tolerance
• Class ZZ Plus tolerance class for reliable go/no-go inspection
• Steel construction for wear resistance and dimensional stability
• Compact, single-piece design suited for bench and floor use
• Package quantity of 1 for individual replacement or kit augmentation

Compatibility

Designed as an OEM-style replacement or standard addition to plug gage sets used for bore inspection at 0.54-inch nominal diameter in Class ZZ Plus tolerance applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians following standard metrology practices. Keep the gage surface clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into an undersized bore, as this can damage the gage surface and affect calibration. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity.