Spi 29-427-2 Class Zz Plus Plug Gage 0.427 in Dia

Product Description

The SPI 29-427-2 is a Class ZZ Plus plug gage used to verify the internal diameter of bored, drilled, or reamed holes to a nominal size of 0.427 inches. It is manufactured from steel and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection tasks in production and quality-control environments. Machinists, toolmakers, and quality technicians use plug gages like this one to confirm that a finished hole falls within specified dimensional limits before a part advances to the next stage of manufacturing or assembly.

This gage is suited for shop-floor inspection and incoming-material verification in machine shops, fabrication facilities, and manufacturing plants. The 0.427-inch diameter targets a specific bore size commonly encountered in precision component work. At 0.2 pounds, the gage is lightweight and easy to handle during repeated inspection cycles. Class ZZ Plus gages are typically applied in commercial-grade tolerancing scenarios where high inspection volume is expected.

Key Features

• Nominal measurement diameter of 0.427 inches for precise bore verification
• Tolerance of 0.0002 inches for reliable Class ZZ Plus accuracy
• Steel construction for durability in production environments
• Lightweight at 0.2 pounds for extended handheld use
• Single-piece package ready for immediate inspection use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for go/no-go bore inspection applications requiring a 0.427-inch nominal diameter at Class ZZ Plus tolerance.

Installation Notes

Plug gages are handled and applied by machinists or quality inspection personnel and do not require power tools or utility shutoffs. Store the gage in a protective case away from abrasive surfaces to preserve the ground finish and dimensional integrity. Clean the gage and the bore with a lint-free cloth before measurement to avoid false readings caused by debris or cutting fluid. Follow your facility's gage calibration and handling procedures in accordance with applicable metrology standards.