Spi 29-403-3 Class Zz Plus Plug Gage 0.403 in Dia

Product Description

The SPI 29-403-3 is a Class ZZ Plus plug gage designed to check the dimensional accuracy of bored holes, drilled passages, and machined openings with a nominal diameter of 0.403 inches. Built from steel, this go/no-go style gage provides a tolerance of 0.0002 inches, making it appropriate for inspection tasks where close dimensional control is required. Machinists, quality technicians, and tool-room professionals use plug gages like this to verify that a finished bore falls within its specified tolerance range before a part moves to the next stage of production or assembly.

This gage is suited for use in machine shops, manufacturing cells, and inspection departments handling precision metalwork. It is applicable in both production-floor spot-checking and bench-level inspection workflows. The 0.403-inch measurement diameter corresponds to a common bore size found in machined components across general manufacturing, tooling, and light industrial fabrication.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for reliable dimensional verification
• Nominal measurement diameter of 0.403 inches
• Steel construction for durability in shop and inspection environments
• Compact and lightweight at 0.2 pounds for easy bench or portable use
• Single-piece packaging suitable for individual replacement or toolbox stocking

Compatibility

Designed as a direct-use Class ZZ Plus plug gage for inspection of 0.403-inch nominal diameter bores in steel, aluminum, and other machined materials. No specific OEM system compatibility is stated for this gage.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians rather than installed in a permanent sense. Clean the bore and the gage contact surfaces before use to avoid false readings caused by chips or coolant residue. Do not force the gage through a bore; excessive insertion force can damage the gage land or the workpiece. Store the gage in its protective sleeve or case when not in use to protect the ground surfaces and maintain calibration integrity.