Belimo KH-AF-1 Crankarm

The Belimo KH-AF-1 Crankarm is a heavy-duty actuator accessory designed for direct mounting onto jackshafts up to 1.05 inches in diameter. Engineered for precise mechanical linkage in HVAC damper control systems, this crankarm is essential for commercial air handling units where standard direct-coupling is not an option. It is specifically compatible with Belimo AF and NF series spring return actuators, ensuring a secure transfer of torque to the damper shaft without slippage. The zinc-plated steel construction provides the rigidity required for high-torque applications, preventing deflection during operation. For technicians performing damper actuator retrofitting, the KH-AF-1 offers adjustable stroke lengths to fine-tune the mechanical advantage and ensure full closure or opening of the damper blades. Integrating this jackshaft crankarm assembly into your control logic ensures reliable performance in demanding airflow management environments where tolerance and durability are non-negotiable.

Key Benefits

• Universal Jackshaft Compatibility: Securely clamps onto rounds shafts up to 1.05", providing a versatile solution for varied HVAC mechanical linkage requirements.
• Industrial Grade Durability: Constructed from high-strength steel to withstand the constant cycling of spring return actuator movements.
• Adjustable Stroke Positioning: Features multiple mounting holes to calibrate the leverage and travel distance for specific damper linkage kits.
• Simplified Field Installation: Designed for rapid attachment to the actuator’s square shaft, reducing labor time during field-mounted actuator replacements.

Common Questions

How do I ensure the KH-AF-1 won't slip on a smooth jackshaft?
The serrated clamping mechanism is designed to bite into the shaft surface. For high-torque applications, ensure the bolt is torqued to manufacturer specifications to maintain a friction-grip connection without damaging the jackshaft.

Can this crankarm be used on square shafts?
While optimized for round jackshafts up to 1.05", the KH-AF-1 is specifically geared toward the AF/NF series actuator output. For square damper shafts, verify dimensions to ensure the clamp can achieve a minimum of three points of contact for stabilized damper control.

What is the maximum torque rating for this linkage accessory?
The KH-AF-1 is rated to handle the full output torque of the Belimo AF series actuators. It is critical to align the crankarm and ball joints properly to avoid lateral loading, which can cause premature wear on the actuator bearings.

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.