Spi 29-409-0 Class Zz Plus Plug Gage 0.409 in

Product Description

The SPI 29-409-0 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.409 inches. It delivers a tolerance of 0.0002 inches, making it suitable for inspection work where tight dimensional control is required. The gage is constructed from steel for durability and consistent performance under repeated use. Metrology technicians, machinists, and quality control inspectors use this type of gage to confirm whether a hole is within specification before a part proceeds to assembly or final acceptance. It is a go or no-go style reference tool used in production and inspection settings.

This plug gage is used in machine shops, manufacturing facilities, and inspection departments handling precision metal parts. It is well suited for verifying drilled, reamed, or bored holes in components where dimensional accuracy is critical. The 0.409-inch nominal diameter targets a specific hole size common in tooling, jig, and fixture work. The Class ZZ Plus designation indicates a commercial-grade tolerance class appropriate for general inspection use rather than master gage applications. It is typically deployed on a shop floor or incoming inspection bench as part of a go or no-go gage set or used as a standalone check gage.

Key Features

• Nominal diameter of 0.409 inches for precise hole inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus dimensional requirements
• Steel construction provides wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy handling
• Single-piece packaging suitable for individual or bench use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspection of 0.409-inch nominal bore diameters in general machining and manufacturing applications.

Installation Notes

Plug gages are handled and used by machinists or quality control technicians and do not require installation in the traditional sense. Keep the gage clean and lightly oiled when not in use to prevent corrosion and dimensional change. Do not force the gage into an undersized hole, as this can damage both the gage and the workpiece. Store in a protective case away from temperature extremes to maintain calibration accuracy.