Spi 29-209-4 Class Zz Plus Plug Gage 0.209 in

Product Description

The SPI 29-209-4 is a Class ZZ Plus plug gage designed to verify the diameter of bored or reamed holes to a nominal size of 0.209 inches. The gage holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in machine shops, toolrooms, and production environments. Constructed from steel, it delivers the dimensional stability required for repeatable measurement. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one to confirm that drilled, reamed, or punched hole features conform to print specifications before parts advance to the next stage of production.

This plug gage is used in toolroom and production inspection settings where hole diameter verification is required. It applies to ferrous and non-ferrous workpieces where a 0.209 inch nominal bore diameter must be confirmed within tight tolerance. Class ZZ Plus gages are typically employed for general-purpose inspection where moderate tolerance control is required, and they are a standard fixture in quality control departments, machine shops, and precision fabrication facilities.

Key Features

• Nominal measurement diameter of 0.209 inches for direct hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for controlled go/no-go verification
• Steel construction for dimensional stability and wear resistance
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece package quantity suited for individual replacement or toolroom stocking

Compatibility

Designed as an OEM-style replacement or direct toolroom addition for applications requiring a Class ZZ Plus plug gage at a 0.209 inch nominal diameter. Fits standard go/no-go gage handle sets compatible with this diameter range.

Installation Notes

Plug gages do not require installation in the traditional sense but should be handled with care to avoid dropping or contact with abrasive surfaces that could alter the gage diameter. Clean the gage and the workpiece bore before inspection to remove chips, oil, or debris that could produce a false reading. Store in a protective case away from other tooling to prevent nicking the gage surface. Calibration and periodic re-certification against traceable standards are recommended per your quality management system requirements.