Spi 29-343-1 Class Zz Plus Plug Gage 0.343 in

Product Description

The SPI 29-343-1 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of bored, drilled, or reamed holes with a nominal diameter of 0.343 inches. Built from steel, it holds a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards for production floor and quality control applications. Machinists, toolroom technicians, and quality inspectors use plug gages like this to verify hole size quickly and reliably without relying on calipers or bore gauges. The 29-343-1 is a direct-use, single-piece gage element suited for repetitive checking in light to moderate production environments.

This plug gage is appropriate for inspecting holes in machined components across manufacturing, maintenance, and repair operations. It is commonly used on the production floor or at a quality inspection station to confirm that a drilled or reamed hole falls within tolerance before assembly. The 0.343-inch size is typical in applications involving close-tolerance fastener holes and locating features in metal and plastic workpieces. A licensed machinist or quality technician performing incoming or in-process inspection would typically handle this gage.

Key Features

• Class ZZ Plus tolerance rating for production-grade hole inspection
• 0.343-inch nominal diameter with 0.0002-inch tolerance
• Steel construction for wear resistance and dimensional stability
• Single-piece plug gage element for quick, repeatable go/no-go checks
• Lightweight at 0.2 pounds for comfortable hand use during inspection

Compatibility

Designed as an OEM-style dimensional inspection tool for go/no-go hole checking of features with a 0.343-inch nominal diameter in standard machined workpieces.

Installation Notes

Plug gages are handled and used by machinists or quality technicians and require no permanent installation. Before use, clean the gage and the hole to be inspected to remove chips, coolant, or debris that could affect the reading. Do not force the gage through a hole; excessive insertion force can damage the gage surface and alter its calibration. Store the gage in a protective case when not in use to prevent nicks, corrosion, and thermal distortion that would compromise accuracy.