Spi 29-342-3 Class Zz Plus Plug Gage 0.342 in Dia

Product Description

The SPI 29-342-3 is a Class ZZ Plus plug gage designed to verify the inside diameter of bored or reamed holes to a nominal size of 0.342 inches. Built from steel, it delivers a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy requirements. Plug gages of this class are GO-style instruments used to confirm that a hole falls within an acceptable dimensional range. Machinists, tool-and-die makers, and quality-control technicians use these gages on the shop floor and in inspection environments to validate conformance to print tolerances.

This gage is suited for precision measurement tasks in machine shops, fabrication facilities, and manufacturing quality departments. It is appropriate for use on drilled, reamed, or bored holes where dimensional verification is required before assembly. The 0.342-inch nominal diameter makes it a direct-fit instrument for checking that specific hole size without the need for setup or adjustment.

Key Features

• Nominal measurement diameter of 0.342 inches for direct hole verification
• Class ZZ Plus tolerance of 0.0002 inches for precision conformance checking
• Steel construction for durability in shop-floor inspection use
• Single-piece plug gage design requires no adjustment or calibration setup before use
• Lightweight at 0.2 pounds, suitable for hand use at the point of inspection

Compatibility

Designed as an OEM-style inspection instrument for verifying 0.342-inch nominal inside diameters in general precision machining and quality-control applications.

Installation Notes

Plug gages are used by machinists and quality technicians and do not require installation in the traditional sense, but proper handling is essential for accurate results. Ensure the workpiece hole and the gage are clean and free of burrs, chips, or coolant before gaging. Do not force the gage through a hole that offers resistance, as this can damage both the gage and the workpiece. Store the gage in a protective case away from other metal tools to prevent wear or damage to the precision ground surface.