Spi 29-473-6 Class Zz Plus Plug Gage 0.473 in Steel

Product Description

The SPI 29-473-6 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of bored holes, drilled passages, and precision-machined openings with a nominal diameter of 0.473 inches. Built from steel, it holds a tolerance of 0.0002 inches, meeting Class ZZ Plus standards for workshop-grade gauging work. Machinists, tool-and-die makers, and quality control technicians use this type of gage to verify hole size acceptance without relying on calipers or micrometers alone. The tight tolerance makes it suitable for production floor inspection where repeatable, fast results are required.

This plug gage is applied in machine shops, fabrication facilities, and manufacturing environments where hole diameter verification is part of incoming inspection, in-process quality checks, or final acceptance testing. It is suited for use on steel, aluminum, and other common workpiece materials. The 0.473-inch nominal diameter targets mid-range precision bores encountered in general machining and light industrial applications.

Key Features

• Class ZZ Plus tolerance rating for workshop-grade dimensional inspection
• 0.473-inch nominal diameter with 0.0002-inch tolerance
• Steel construction for durability and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Designed for fast go/no-go pass-fail hole checking on the production floor

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in general machining and manufacturing quality inspection applications requiring a 0.473-inch nominal hole diameter check.

Installation Notes

Plug gages are handled and used by machinists or quality technicians and do not require power or mechanical installation. Clean both the gage and the workpiece bore before use to prevent debris from causing false readings or gage wear. Store the gage in its protective case when not in use to preserve the lapped surfaces and maintain calibration accuracy. Periodic recalibration against certified masters is recommended per your facility quality management procedures.