Spi 29-747-3 Class Zz Plus Plug Gage 0.747 in

Product Description

The SPI 29-747-3 is a Class ZZ Plus plug gage used to verify hole diameter in precision inspection and quality control applications. It measures a nominal diameter of 0.747 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go functional checking of bored, drilled, or reamed holes. The gage is constructed from steel for durability and dimensional stability under repeated use. Machinists, tool-and-die makers, and quality technicians rely on this type of gage for fast, reliable in-process or receiving inspection checks on the shop floor or in the inspection room.

This plug gage is used in manufacturing, machining, and fabrication environments where hole size conformance must be verified to tight tolerances. It is appropriate for both production-line inspection and bench inspection tasks. The 0.747-inch diameter targets common bored or reamed hole sizes encountered in general metalworking. The compact form factor and lightweight design at 0.2 pounds allow easy handling during repetitive inspection cycles. It is packaged individually and sold as a single unit.

Key Features

• Class ZZ Plus tolerance grade for go/no-go hole inspection
• 0.747-inch nominal measurement diameter
• 0.0002-inch tolerance for precise conformance checking
• Steel construction for wear resistance and dimensional stability
• Lightweight at 0.2 pounds for comfortable repetitive use
• Single-unit packaging for individual purchase or replacement stocking

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of 0.747-inch nominal diameter holes in general metalworking, machining, and fabrication applications.

Installation Notes

Plug gages are used by machinists and quality technicians and require no installation in the traditional sense, but proper handling is essential to maintain accuracy. Store the gage in a protective case or sleeve when not in use to prevent nicks and surface damage. Clean the gage and the workpiece hole before each use to remove chips, coolant, or debris that could affect the measurement result. Periodic recalibration against a traceable standard is recommended to verify continued gage accuracy over time.