Spi 29-547-7 Class Zz Plus Plug Gage 0.547 in

Product Description

The SPI 29-547-7 is a Class ZZ Plus plug gage designed to verify bore and hole diameters with precision in machine shop and manufacturing environments. Built from steel, this fixed-limit gage checks a nominal diameter of 0.547 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows where dimensional accuracy is critical. Weighing just 0.2 pounds, it is a compact, hand-held inspection tool used by machinists, quality control technicians, and tool-and-die professionals on the shop floor.

Class ZZ Plus plug gages are used in general-purpose dimensional inspection of drilled, reamed, and bored holes in both production and toolroom settings. This gage is appropriate for inspecting holes in metal and plastic workpieces where tight dimensional tolerances must be confirmed before assembly or further machining. It is a standard item in quality assurance kits across aerospace, automotive, and general manufacturing operations.

Key Features

• Class ZZ Plus accuracy grade for general-purpose go/no-go hole inspection
• 0.547 inch nominal diameter measurement range
• 0.0002 inch tolerance for reliable dimensional verification
• Steel construction for durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy single-hand use

Compatibility

Designed as an OEM-style fixed-limit inspection tool for verifying 0.547 inch diameter bores in general manufacturing and toolroom applications.

Installation Notes

Plug gages are handled and used by machinists and quality control inspectors — no permanent installation is required. Clean the gage and the bore being measured before use to prevent debris from affecting readings. Store the gage in a protective case away from other tooling to prevent surface damage that could compromise accuracy. Handle with care to avoid dropping, as impact can alter gage geometry and invalidate calibration.