Belimo ZG-LMSA Shaft Extension

The Belimo ZG-LMSA is a heavy-duty shaft extension engineered for technicians dealing with short damper shafts in the field. Designed specifically for 1/2 inch diameter shafts, this mechanical accessory provides a 3-inch effective extension (5/8 inch outside diameter) to ensure proper actuator engagement when the existing spindle length is insufficient. It is a critical component for damper actuator mounting, specifically compatible with Belimo LM and LF series actuators, allowing the universal clamp to firmly grip the drive mechanism without compromising torque transmission.

Constructed from high-grade materials to withstand the rigors of HVAC control systems, the ZG-LMSA facilitates a secure connection via two integrated set screws that bite into the original shaft for a slip-free fit. Whether you are performing a damper actuator replacement or a new installation where the ductwork or insulation limits access, this extension provides the necessary clearance to bring the actuator out from the damper frame. Using the Belimo ZG-LMSA Shaft Extension ensures your installation remains square and true, adhering to standard trade practices for air-tight damper performance and precise HVAC actuator accessories integration.

• Ensures robust actuator shaft extension on 1/2" diameter damper spindles with a 3" total length.
• Eliminates the need for costly damper replacements in short-shaft scenarios for Belimo LM series and Belimo LF series.
• Features dual set-screw mounting for maximum grip and reliable performance in high-duty cycle applications.
• Simplifies damper actuator installation by extending the mechanical reach of the universal clamp.
• Maintains alignment integrity for precise control of air dampers and valves.

What is the minimum shaft length required before using this extension?
The LM series generally requires a minimum of 1.5 inches of original shaft. The ZG-LMSA is utilized when the existing shaft falls below these installation requirements to provide a stable mounting surface.

Is this compatible with square shafts?
While optimized for 1/2 inch diameter shafts (round), any use on non-standard profiles requires verifying that the set screws can achieve a secure, flat contact point to prevent rotational slip.

Can I use this with other actuator brands?
While designed as a Belimo accessory, it serves as a generic 1/2" to 5/8" OD extension. However, for technical SEO and performance reliability, we recommend pairing it with the specified Belimo series to ensure the clamp geometry matches the extension diameter.

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.