Klein Tools BL9 Hex Key 9/64 Inch Ball End Long Arm

Product Description

The KLEIN TOOLS BL9 is a long-arm ball end hex key designed for fastener access in tight or angled workspaces. The ball end tip allows engagement with hex fasteners at angles up to 25 degrees, reducing the need to reposition the tool during installation. The L-handle design provides direct torque on the short arm and extended reach on the long arm. Overall length is 4 inches. The key is constructed from steel for durability under regular trade use. Electricians, HVAC technicians, and mechanical contractors use this type of hex key for equipment panels, junction boxes, and mechanical assemblies where socket clearance is limited.

The BL9 is suited for residential and light commercial service work where 9/64-inch hex fasteners are encountered. Common applications include tightening or removing set screws on motor shafts, electrical enclosure hardware, and HVAC cabinet fasteners. The long-arm geometry provides greater reach into recessed fastener locations compared to standard-arm hex keys. The non-insulated steel body keeps weight minimal at 0.03 pounds, making it a practical addition to a service pouch or tool roll.

Key Features

• Ball end tip allows fastener engagement up to 25 degrees off-axis
• Long arm design extends reach into recessed or obstructed fastener locations
• L-handle provides two-position use: torque on short arm, reach on long arm
• 9/64-inch hex size in inch measurement system
• Steel construction for strength and wear resistance
• Non-insulated body suitable for mechanical and structural fastener work

Compatibility

Designed for use with 9/64-inch internal hex fasteners in mechanical, electrical, and HVAC service applications. Fits standard hex socket cap screws and set screws of the corresponding size.

Installation Notes

This tool is used by electricians, HVAC technicians, and mechanical service professionals. No power source is required, but always de-energize equipment before accessing fasteners on electrical enclosures or motor assemblies. Use the short arm for higher torque and the long arm for low-torque, high-reach situations. Do not apply excessive force through the ball end, as it is intended for light-duty angled engagement, not primary high-torque driving.