Spi 29-472-8 Class Zz Plus Plug Gage 0.472 in

Product Description

The SPI 29-472-8 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a tight tolerance standard in machining and manufacturing environments. Built from steel, it checks a nominal diameter of 0.472 inches with a tolerance of 0.0002 inches, making it a reliable go/no-go reference for quality control inspections. This type of gage is a standard tool in machine shops, tool rooms, and production floor inspection stations where dimensional accuracy is critical to part acceptance.

Class ZZ Plus plug gages are commonly used in light-duty production inspection and tool room applications where bore sizing must be confirmed quickly and consistently. This gage suits verification tasks on drilled, reamed, or bored holes in metal components. Machinists, quality technicians, and tool room specialists use plug gages as part of incoming, in-process, and final inspection routines to ensure hole dimensions conform to print specifications.

Key Features

• Nominal measurement diameter of 0.472 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for consistent go/no-go inspection
• Steel construction for durability in production and tool room use
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-piece package quantity suited for individual workstation use

Compatibility

Designed as an OEM-style precision measurement tool for use in standard plug gage handles and holders sized to accept 0.472-inch diameter Class ZZ plug gage members.

Installation Notes

Plug gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion and measurement error from surface contamination. Store the gage in its case when not in use to protect the precision ground surfaces. Calibration intervals should follow your facility quality management plan and applicable standards such as ASME B89.1.5. Do not force the gage into an undersized bore, as this can damage both the gage and the workpiece.