Wera 05066420001 Square Recess Power Screwdriver Bit

Product Description

The WERA 05066420001 is a power screwdriver bit designed for square recess (Robertson) fasteners at a No. 4 point size. It features a 1/4 inch hex shank for use with power drivers, impact drivers, and drill/driver chucks that accept standard 1/4 inch hex bits. The overall length is 1 inch, and the body diameter measures 8 millimeters. This bit is suited for HVAC technicians, electricians, plumbers, and other trade professionals who drive large-diameter square recess fasteners in panel assemblies, junction boxes, and equipment enclosures.

The No. 4 square recess point size is used primarily with large-gauge fasteners found in heavy-duty electrical panels, industrial enclosures, and structural assembly applications. The 1/4 inch hex drive makes this bit compatible with standard power screwdriver chucks and quick-change bit holders commonly carried on service vans. It is sold as a single bit per package.

Key Features

• Square recess (Robertson) bit type for positive engagement and reduced cam-out
• No. 4 specialty point size for large-gauge fastener applications
• 1/4 inch hex shank fits standard power driver and quick-change holders
• 1 inch overall length suits compact driver configurations
• 8 millimeter body diameter provides solid cross-section and durability under power torque

Compatibility

Designed for use with any power screwdriver, drill/driver, or impact driver accepting a standard 1/4 inch hex bit shank. Fits square recess No. 4 fasteners.

Installation Notes

Install and remove bits only when the driver tool is powered off or the battery is removed. Confirm point size matches the fastener recess before applying power to avoid fastener or bit damage. Inspect the bit for wear or rounding before each use, particularly when driving high-torque fasteners with an impact driver.