Spi 29-457-9 Class Zz Plus Plug Gage 0.457 in

Product Description

The SPI 29-457-9 is a Class ZZ Plus plug gage machined to a 0.457-inch nominal diameter with a tolerance of 0.0002 inches. Plug gages are go/no-go precision inspection tools used to verify that a drilled, reamed, or bored hole falls within a specified diameter tolerance. This gage is constructed from steel and is sized for use in quality control and inspection workflows on the shop floor. Machinists, toolmakers, and quality technicians use plug gages during in-process and final inspection to confirm hole conformance without requiring a measuring instrument readout.

This gage is suited for inspection of small-diameter holes in machined components across general manufacturing, toolroom, and production environments. It is appropriate for both one-off toolroom work and repetitive production inspection where fast pass/fail verification of a 0.457-inch hole is required. The Class ZZ Plus designation indicates a commercial-grade tolerance class intended for general-purpose inspection rather than master or working-gage applications.

Key Features

• 0.457-inch nominal diameter for direct hole conformance inspection
• 0.0002-inch tolerance meets Class ZZ Plus gage specifications
• Steel construction for durability in shop floor inspection use
• Compact single-piece gage format for fast pass/fail checking
• Go/no-go inspection method eliminates need for variable measurement readout

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring inspection of a 0.457-inch nominal diameter hole to Class ZZ Plus tolerance standards.

Installation Notes

Plug gages should be handled and stored carefully to prevent surface damage that would affect measurement accuracy. Clean the gage and the hole to be checked before use. Apply light gage oil when inserting to reduce wear on the gage surface. Gages should be periodically recalibrated or re-certified according to your facility quality management requirements.