Spi 29-401-7 Class Zz Plus Plug Gage 0.401 in

Product Description

The SPI 29-401-7 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.401 inches. It holds a tolerance of 0.0002 inches, making it suitable for dimensional inspection work where precise go/no-go verification is required. Constructed from steel, this gage provides the wear resistance and dimensional stability expected in a production or inspection environment. Metrology technicians, machinists, and quality control professionals use plug gages like this one to confirm that machined holes fall within specified tolerance bands before assembly or shipment.

This plug gage is used in machine shops, manufacturing facilities, and quality inspection departments for incoming, in-process, and final inspection of drilled, reamed, or bored holes. The Class ZZ Plus designation indicates a working gage tolerance class appropriate for general-purpose inspection. It is suited for both job shop and production environments where consistent hole acceptance criteria must be maintained across batches.

Key Features

• Nominal measurement diameter of 0.401 inches for targeted hole verification
• Tolerance of 0.0002 inches for reliable Class ZZ Plus dimensional control
• Steel construction provides durability and resistance to wear during repeated use
• Compact and lightweight at 0.2 pounds for easy hand use during inspection
• Single-piece package quantity suits individual purchase and bench use

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for verifying 0.401-inch nominal diameter bores in standard machined components across a range of materials and industries.

Installation Notes

Plug gages are handled by metrology or quality control personnel and do not require installation in the traditional sense. Before use, clean both the gage and the bore being checked to remove chips, coolant, and debris that could affect the reading. Store the gage in its protective case when not in use to prevent nicks or corrosion that would compromise accuracy. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity over time.