Spi 29-524-6 Class Zz Plus Plug Gage 0.524 in

Product Description

The SPI 29-524-6 is a Class ZZ Plus plug gage designed for precise hole diameter verification in machine shops, manufacturing facilities, and quality control environments. With a measurement diameter of 0.524 inches and a tolerance of 0.0002 inches, this gage provides the accuracy required for critical go/no-go inspection work. Constructed from steel, it is built to withstand repeated use in production settings. Machinists, tool-and-die makers, and quality technicians rely on plug gages like this one to confirm bore dimensions conform to print tolerances before parts advance through a manufacturing process.

The 29-524-6 is suited for inspecting drilled, reamed, or bored holes where a 0.524-inch nominal diameter must be held to tight tolerances. It is appropriate for both incoming inspection of purchased parts and in-process verification on production floors. Class ZZ Plus designation indicates the gage meets the tighter end of the ZZ tolerance class, making it well-suited for general-purpose inspection where dimensional accuracy is critical but full Class Z precision is not required.

Key Features

• Measurement diameter of 0.524 inches for accurate bore verification
• Tolerance of 0.0002 inches meets Class ZZ Plus requirements
• Steel construction provides durability for repeated shop-floor use
• Single-piece package ready for immediate deployment in inspection workflows
• Compact and lightweight at 0.2 pounds for easy handling

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of 0.524-inch nominal diameter bores in general manufacturing and machining applications.

Installation Notes

Plug gages are handled and applied by machinists or quality inspection personnel — no power tools or electrical isolation is required. Before use, clean the gage and the bore being inspected to remove chips, coolant, and debris that could affect the measurement reading. Handle the gage with care to avoid dropping or striking it, as impact damage can alter its calibration. Periodic recalibration against certified gage blocks is recommended to maintain traceability to measurement standards.