Belimo AV8-25 Shaft Extension

The Belimo AV8-25 Shaft Extension is a professional-grade mechanical accessory engineered for damper shafts where standard actuator mounting is restricted by clearance or depth. Constructed from heavy-duty galvanized steel, this 9.8-inch (240 mm) extension is designed to provide a secure, slip-free connection for damper shaft diameters ranging from 5/16" to 1" (8 mm to 22.7 mm). As a veteran technician knows, maintaining axial alignment is critical in HVACR systems; the AV8-25 ensures a robust mechanical link between the damper and the Belimo actuator, facilitating efficient torque transfer even in tight mechanical rooms or recessed duct configurations.

This extension is universally compatible with a wide range of Belimo actuator series, including LMQ, NMD, NMQ, SM, and SF models. By extending the effective reach of the shaft by 240 mm, it allows for the installation of direct-coupled actuators in stationary heating, ventilation, and air-conditioning systems where the original shaft is too short. The 20 mm diameter of the extension rod provides the necessary structural rigidity to prevent bowing or fatigue under high-torque applications, ensuring long-term operational reliability in commercial HVAC installations.

• Wide Compatibility: Specifically designed to interface with Belimo LF, LMQ, NF, NKQ, NM, SF, and SM series actuators.
• Durable Construction: Fabricated from high-quality galvanized steel for maximum corrosion resistance and mechanical strength.
• Versatile Range: Clamps securely onto shaft diameters from 8 mm up to 22.7 mm, covering the majority of standard damper sizes.
• Extended Reach: Provides a 9.8-inch (240 mm) extension to overcome installation obstacles and shallow shaft depths.
• Field Reliability: Precision-engineered to eliminate shaft slippage and ensure accurate damper positioning.

Is the AV8-25 compatible with both round and square shafts?
Yes, the clamping mechanism is designed to accommodate standard round shafts and may qualify for certain square shaft profiles within the 8 mm to 22.7 mm range, though direct-fit on round shafts is the primary application.

Can this extension be cut to a shorter length in the field?
While the Belimo AV8-25 is set at 240 mm, technicians occasionally trim extensions; however, maintaining the structural integrity and clamping seat is vital for proper actuator performance.

What is the primary material used in its construction?
The unit is manufactured from galvanized steel, ensuring it stands up to the humidity and temperature fluctuations common in industrial AHU and ductwork environments.

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.