Spi 29-430-6 Class Zz Plus Plug Gage 0.43 Inch

Product Description

The SPI 29-430-6 is a Class ZZ Plus plug gage designed for precise go/no-go inspection of machined holes and bores. It measures a nominal diameter of 0.43 inches with a tolerance of 0.0002 inches, providing the dimensional accuracy required for quality control in production and maintenance environments. Constructed from steel for durability and wear resistance, this gage is a direct-use inspection tool suited for machinists, toolmakers, and quality technicians working to close tolerances. It is used at the point of manufacture or inspection to verify that a bore falls within specified dimensional limits.

This plug gage is suited for use in machine shops, manufacturing facilities, and maintenance environments where hole diameter verification is required. Class ZZ Plus gages are commonly applied in lower-precision production inspection where standard go/no-go verification is required. The 0.43-inch diameter makes it appropriate for inspecting bores in a range of machined components including housings, brackets, and mechanical assemblies. It is handled directly by quality inspectors or machinists as part of incoming, in-process, or final inspection routines.

Key Features

• 0.43 inch nominal diameter for direct bore inspection
• 0.0002 inch tolerance for reliable Class ZZ Plus dimensional verification
• Steel construction for wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece package — ready to use out of the box

Compatibility

Designed as an OEM-style inspection gage for use wherever a 0.43 inch nominal diameter go/no-go bore check is required in standard Class ZZ Plus applications.

Installation Notes

Plug gages do not require installation in the traditional sense but should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, verify the gage has stabilized to ambient shop temperature to avoid thermal expansion errors. Store in a protective case away from other metal tools to prevent nicking the gage surface. Calibration checks against certified masters are recommended at regular intervals per your facility quality plan.