Spi 29-043-7 Class Zz Plus Plug Gage 0.043 in

Product Description

The SPI 29-043-7 is a Class ZZ Plus plug gage used to verify bore and hole diameters in precision machining and inspection applications. Manufactured from steel, this gage is sized at 0.043 inches in diameter with a tolerance of 0.0002 inches, making it suitable for high-accuracy dimensional verification. Class ZZ Plus plug gages are a standard tool in quality control environments where confirming go/no-go conditions on small-diameter features is required. Machinists, tool and die technicians, and quality inspectors rely on this type of gage to maintain tight production tolerances on drilled, reamed, or bored features.

This gage is appropriate for use in precision manufacturing shops, job shops, and inspection departments working with small-bore components. It is commonly used when verifying holes in metal parts, instrument housings, and other assemblies where dimensional accuracy at the 0.043-inch nominal size must be confirmed. Supplied individually, the 29-043-7 fits into standard plug gage handle systems compatible with its diameter range.

Key Features

• 0.043 inches nominal diameter for small-bore inspection
• 0.0002 inches tolerance for high-accuracy Class ZZ Plus classification
• Steel construction for durability and wear resistance
• Single-piece package quantity for individual replacement or kit supplement
• Lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as an OEM-style replacement or standalone plug gage member compatible with standard plug gage handle systems sized for the 0.043-inch diameter range.

Installation Notes

Plug gages are installed by quality control technicians and machinists — no power tools or energized systems are involved. Insert the gage member into the appropriate handle and ensure it is fully seated before use. Gages should be stored in a clean, dry environment and handled with care to avoid surface damage that could affect measurement accuracy. Calibration intervals should follow your facility's quality management procedures and applicable ASME B89 standards.