Siemens Building Technology 331-958 Link Kit

When you're out in the field servicing pneumatic damper systems, the Siemens Building Technology 331-958 Link Kit (also known as the AP331 Linkage Kit) is the standard for maintaining precise airflow control. This professional-grade crank and link kit is purpose-built for seamless integration with Siemens #3, #4, and #6 pneumatic damper actuators. The kit features a 4-inch link and a rugged crank assembly designed to translate pneumatic force into reliable mechanical motion without slipping or binding.

As a mechanical linkage assembly, the 331-958 provides the critical connection between the actuator piston and the damper shaft, ensuring linear response and consistent torque transfer. Whether you are performing a routine retrofit or urgent onsite repairs, this damper actuator hardware allows for quick installation and fine-tuned stroke adjustment. Using OEM HVAC pneumatic controls parts like this ensures that the linkage geometry matches the manufacturer's specifications, preserving the operating range of your Powers Controls actuators and preventing premature wear on the shaft bearings.

• Universal Compatibility: Engineered specifically for Siemens #3, #4, and #6 actuators, eliminating the need for makeshift field fabrications.
• Precision Machining: The 4-inch link and crank are manufactured to tight tolerances to prevent mechanical play and maintain accurate damper positioning.
• Industrial Durability: Built from heavy-duty materials to withstand the high-cycle demands of commercial HVAC and process control environments.
• Easy Installation: Standardized mounting hardware ensures that technicians can complete the linkage kit service quickly and get the system back online.

Which actuators is this kit compatible with?
The 331-958 is designed to work with Siemens/Powers #3, #4, and #6 pneumatic damper actuators.

Does this kit include the 4-inch link?
Yes, the Siemens AP331 kit includes both the 4-inch link and the corresponding crank for a complete assembly.

Can this be used for valve actuators?
No, this linkage kit is specifically engineered for pneumatic damper actuators to control airflow in ductwork and air handling units.

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.