Spi 29-436-3 Class Zz Plus Plug Gage 0.436 in Steel

Product Description

The SPI 29-436-3 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.436 inches with a tolerance of 0.0002 inches. Built from steel, this go/no-go style inspection tool provides machinists, quality technicians, and tool room professionals with a reliable, repeatable method for dimensional verification. Class ZZ Plus gages meet standard tolerance grades for production inspection work, making this gage appropriate for moderate-precision applications where consistent hole sizing must be confirmed before assembly or further machining operations proceed.

This plug gage is suited for use in machine shops, manufacturing facilities, and maintenance environments where hole diameter verification is part of routine quality control. It is appropriate for inspecting drilled, reamed, or bored holes in production runs or one-off parts. Technicians use plug gages of this type during in-process inspection and final part acceptance checks. The 0.436-inch nominal diameter targets a specific bore size common in mechanical assemblies and tooling setups.

Key Features

• Nominal measurement diameter of 0.436 inches for precise bore verification
• Tolerance of 0.0002 inches meets Class ZZ Plus gage grade requirements
• Steel construction for durability and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece package quantity suits individual technician or tool crib stocking

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in general production inspection of bored, drilled, or reamed holes at 0.436 inches nominal diameter. Consult your applicable gage standard or quality plan to confirm suitability for your specific tolerance requirements.

Installation Notes

Plug gages are handled, not installed; however, proper use requires that the gage and workpiece be at the same temperature, typically 68 degrees F, to avoid thermal expansion error. Clean both the gage and the bore with a lint-free cloth before use. Never force a plug gage into an undersized hole, as this can damage the gage land and compromise measurement accuracy. Store the gage in its protective case when not in use to prevent surface damage and corrosion.