Valley Tool 1403-L Crank Arm

The Valley Tool 1403-L Crank Arm is a heavy-duty linkage component designed for high-torque HVAC damper control applications. For technicians managing commercial airflow systems, this 3/8" shaft crank arm provides the necessary leverage for precise louver positioning and actuator synchronization. Manufactured with a long crank arm profile, the 1403-L allows for greater mechanical advantage and travel distance compared to standard short-arm variants, making it essential for complex damper linkage setups.

Constructed for professional-grade durability, the unit features a high-quality ROHS bright zinc finish to resist corrosion in high-moisture plenum environments. This HVAC actuator linkage part ensures a secure fit on 3/8-inch diameter drive shafts, preventing slippage during high-velocity air cycles. Whether you are performing a field replacement or a new system installation, the 1403-L stands as a reliable standard in the industry for maintaining accurate damper modulation and structural integrity within the ductwork.

• Enhanced Leverage: The extended arm length increases torque efficiency for larger damper banks.
• Corrosion Resistance: Zinc-plated finish protects against oxidation in demanding HVACR environments.
• Universal Compatibility: Designed for standard 3/8" round or square shafts typically found in commercial actuators.
• Precision Fit: Rigid construction minimizes mechanical play, ensuring tight damper closure and airflow control.

What is the primary difference between the 1403-L and the 1403-S?
The 1403-L is the "Long" version, providing a wider throw and more leverage, whereas the 1403-S is the "Short" version designed for compact clearance areas with shorter travel requirements.

Does this crank arm come with the set screw included?
Yes, these units typically include the necessary heavy-duty set screw to bite into the 3/8" shaft for a non-slip connection.

Can this be used on 1/2" shafts?
No, this specific model is bored exclusively for 3/8" shafts. For 1/2" applications, the 1405-L is the required equivalent.

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.