Spi 29-203-7 Class Zz Plus Plug Gage 0.203 in Dia

Product Description

The SPI 29-203-7 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of drilled, reamed, or machined holes with a nominal diameter of 0.203 inches. Built from steel, this go/no-go style gage provides a tolerance of 0.0002 inches, making it suitable for inspection applications where close-tolerance hole verification is required. Machinists, quality control technicians, and toolroom professionals use plug gages like this one to confirm that bored or finished holes fall within specified limits before parts advance to assembly or final inspection.

This gage is used in machine shops, manufacturing facilities, and toolrooms for incoming inspection, in-process quality checks, and final part verification. It is appropriate for residential or light commercial applications wherever precise hole sizing must be confirmed on steel, aluminum, or similar workpiece materials. The 0.203-inch diameter targets holes produced by standard twist drills or reamers at or near that nominal size.

Key Features

• Class ZZ Plus tolerance rating of 0.0002 inches for close-tolerance hole inspection
• Steel construction for durability and dimensional stability during repeated use
• Nominal measurement diameter of 0.203 inches
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Sold individually for single-size toolroom or bench inspection use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspection of machined holes at a 0.203-inch nominal diameter in standard toolroom and quality control applications.

Installation Notes

Plug gages are handled and used by quality control technicians and machinists — no power source or special installation is required. Store the gage in its protective case when not in use to prevent nicks or burrs that could affect measurement accuracy. Clean both the gage and the workpiece hole before use to remove chips, coolant, or debris that could produce false readings. Apply light gage oil periodically to protect the steel surface from corrosion.