The Belimo KH-AFB Crankarm is a heavy-duty linkage accessory specifically engineered for high-torque AFB and NFB series actuators. Designed for non-direct coupled mounting applications, this actuator crank arm provides a secure mechanical connection to 3/4 inch damper shafts, accommodating round spindles with a clamping range of 10 to 22 mm. Constructed from durable galvanized steel and zinc die-cast materials, it ensures precise torque transfer and long-term reliability in demanding HVAC ventilation control systems. This component is essential for technicians performing retrofits where direct mounting is not feasible or when driving a secondary damper linkage from the same actuator. Integration is seamless with the ZG-118 mounting bracket, allowing for horizontal or vertical orientations to match the bolt patterns of legacy Honeywell or Johnson Controls foot-mounted actuators. Its 8.2 mm slot width is optimized for consistent mechanical alignment, making it a staple for commercial damper linkage kits and custom field assemblies.

• Direct Compatibility: Purpose-built for AFB, AFX, NFB, and NFX series actuators to ensure a perfect fit and efficient power transmission.
• Versatile Shaft Range: Clamps securely onto 3/4 inch round shafts and can also accommodate square shafts up to 5/8 inch.
• Retrofit Ready: Simplifies the replacement of obsolete foot-mounted actuators when used with universal mounting hardware.
• Rugged Construction: Galvanized steel finish provides superior corrosion resistance in mechanical rooms and rooftop units.
• Dual-Drive Logic: Enables the actuator to simultaneously direct-couple to one shaft while linking to a second damper via the crank arm.

Which actuators work with the KH-AFB?
This crank arm is designed specifically for the Belimo AFB and NFB spring return actuator families, including the AFX and NFX higher-torque variations.

What is the maximum shaft size for this linkage?
The KH-AFB is optimized for 3/4" shafts, with a functional clamping range for round spindles between 10mm and 22mm.

Can I use this for non-direct coupling?
Yes, this is the primary component required to convert a direct-coupled actuator into a crank-arm style operation, often necessary for tight clearances or legacy linkage setups.

Non Cancelable / Non Returnable

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.