Spi 29-745-7 Class Zz Plus Plug Gage 0.745 in

Product Description

The SPI 29-745-7 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of drilled, reamed, or bored holes in precision machining and manufacturing environments. It measures a nominal diameter of 0.745 inches with a tolerance of 0.0002 inches, making it appropriate for go/no-go inspection workflows where tight dimensional conformance is required. Constructed from steel, this gage is built to withstand repeated use in shop-floor inspection applications. Machinists, quality control technicians, and tool-room professionals are the primary users of this type of gage.

The 29-745-7 is suited for use in production environments where hole size verification must meet close-tolerance requirements. Class ZZ designation indicates a commercial-grade tolerance class appropriate for inspection of general-purpose holes. This gage is a standard single-piece unit and is typically used alongside a no-go member to complete a full go/no-go inspection set. Applications include inspection of machined bores in metal fabrication, automotive components, and general industrial manufacturing.

Key Features

• 0.745 inches nominal measurement diameter for precise hole inspection
• 0.0002 inches tolerance meets Class ZZ Plus accuracy requirements
• Steel construction provides durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-piece plug format compatible with standard go/no-go inspection procedures

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go hole inspection of 0.745 inch nominal diameter bores in general industrial and precision machining applications.

Installation Notes

Plug gages are handled and used by machinists or quality control inspectors and do not require installation in the traditional sense. Prior to use, ensure the gage and the workpiece bore are clean and free of debris, chips, or coolant residue that could affect measurement accuracy. Handle the gage by the knurled handle or body to avoid introducing thermal expansion from hand heat, which can affect readings at tight tolerances. Store the gage in a protective case when not in use to prevent surface damage and preserve calibration.