The FESTO DSM-16-270-P-A-B is a compact semi-rotary pneumatic actuator developed for applications that need dependable angular movement in a limited installation space. Instead of producing linear travel like a standard pneumatic cylinder, this model converts compressed air into rotary motion, making it suitable for turning, indexing, opening, closing, positioning, and switching functions in automated machinery. The unit belongs to the FESTO DSM family of vane-driven rotary actuators and is designed for users who need controlled swivel motion with stable torque, straightforward mounting, and durable industrial construction.
This specific version, part number 547574, is configured with a 0 to 270 degree swivel angle, which gives it a broader movement range than many compact rotary actuators used only for 90 degree or 180 degree movement. That wider angular range makes it particularly practical in automated handling systems, fixture mechanisms, diverter systems, workpiece orientation devices, flap control units, and compact process modules where a larger turning arc is required. FESTO specifies that this actuator operates with a double-acting vane design, meaning compressed air drives the rotation in both directions for more controlled and repeatable movement.
Key Technical Data
| Item | Specification |
|---|---|
| Brand | FESTO |
| Model | DSM-16-270-P-A-B |
| Part Number | 547574 |
| Product Type | Semi-rotary drive |
| Series | DSM |
| Size | 16 |
| Swivel Angle | 0° to 270° |
| Rotation Angle Adjustment Range | 0° to 270° |
| Cushioning Angle | 1.4° |
| Operating Principle | Vane |
| Mode of Operation | Double-acting |
| Cushioning | Elastic cushioning rings/plates at both ends |
| Fine Adjustment | -6° |
| Position Detection | Via proximity switch |
| Operating Pressure | 1.8 to 10 bar |
| Max. Swivel Frequency at 6 bar | 2 Hz |
| Repetition Accuracy | 1° |
| Max. Stop Force | 160 N |
| Max. Axial Force | 30 N |
| Max. Radial Force | 75 N |
| Theoretical Torque at 6 bar | 2.5 Nm |
| Permissible Mass Moment of Inertia | 0.01 kgm² |
| Pneumatic Connection | M5 |
| Mounting Type | Via female thread |
| Ambient Temperature | -10 °C to 60 °C |
| Product Net Weight | 470 g |
| Housing Material | Wrought aluminium alloy |
| Drive Shaft Material | Nickel-plated steel |
| Seal Material | TPE-U (PU) |
All values above are taken from the official FESTO datasheet for model DSM-16-270-P-A-B / 547574.
Product Design and Motion Characteristics
One of the main strengths of the DSM-16-270-P-A-B is its compact rotary-vane design. In practical machine design, rotary motion is often needed for functions such as turning a part into the next process position, opening or closing a small gate, moving a stop arm, changing the direction of a guide plate, or switching a tool holder between two working angles. A semi-rotary drive simplifies these tasks because the actuator directly produces angular output without needing a separate linkage to convert linear movement into rotation. FESTO identifies this model as a vane-type actuator, and that structure helps keep the body compact while maintaining usable torque for industrial automation.
The 270 degree swivel capability is especially useful where the mechanism must rotate farther than a standard quarter-turn device. It provides more flexibility in machine layout and can reduce the need for extra transmission components. In addition, the actuator includes elastic cushioning at both ends, which helps reduce impact at the end positions. That matters in repetitive duty because it supports smoother stopping behavior and lowers mechanical shock transferred to the machine frame or attached tooling. FESTO also lists a cushioning angle of 1.4 degrees and fine adjustment of -6 degrees, showing that the unit is not just a basic rotary actuator but one intended for more controlled positioning within its working range.
Torque, Load Capacity, and Dynamic Performance
For a compact rotary actuator, the DSM-16-270-P-A-B offers a practical torque level. FESTO states a theoretical torque of 2.5 Nm at 6 bar, which makes the actuator suitable for light to medium rotary tasks in assembly equipment, small transfer units, fixture control, or process automation stations. This torque level is generally enough for rotating lightweight components, indexing plates, stops, arms, sensor brackets, or other compact machine elements, provided the mechanical layout stays within the specified load limits.
The official data also lists a maximum stop force of 160 N, maximum axial force of 30 N, maximum radial force of 75 N, and a permissible mass moment of inertia of 0.01 kgm². These figures are important when engineers assess whether the actuator can safely manage the connected load and whether the rotating attachment is properly matched to the unit. In real applications, these limits help determine lever length, load placement, coupling design, and end-stop conditions. The actuator is therefore a good fit for properly engineered compact mechanisms, but like any rotary actuator, it should not be treated as a heavy-duty turning module beyond its rated mechanical envelope.
FESTO further specifies a maximum swivel frequency of 2 Hz at 6 bar and a repetition accuracy of 1 degree. That means the DSM-16-270-P-A-B can be used in repeat-cycle automation rather than only occasional manual-style actuation. For machine builders, this is valuable because it allows the actuator to support repetitive switching and positioning tasks on automated lines where consistent cycling matters.
Weight and Installation Advantages
The product weight of 470 g is one of the practical advantages of the DSM-16-270-P-A-B. In compact automation design, actuator weight affects more than shipping cost. It influences bracket design, moving-mass calculations, support frame loading, and overall installation flexibility. A rotary actuator in this weight class is easier to integrate into smaller machines, lighter subassemblies, and modular automation equipment without unnecessarily increasing structural mass.
This model uses female-thread mounting and an M5 pneumatic connection, both of which support straightforward integration into compact pneumatic systems. The datasheet also notes that the mounting position is optional, which gives designers more flexibility when arranging the actuator in horizontal, vertical, or custom machine orientations. That flexibility can simplify the design of turning stations, actuator brackets, and compact automation cells where component placement is limited by surrounding tooling or guarding.
Because the actuator also supports position detection via proximity switch, it can be integrated more easily into automated control systems that need signal-based monitoring of rotary position. That is useful in production equipment where the controller must verify whether the mechanism has reached its expected end position before the next machine step is released.
Materials, Operating Conditions, and Service Suitability
FESTO specifies a wrought aluminium alloy housing, a nickel-plated steel drive shaft, and TPE-U (PU) seals for this model. These material choices are appropriate for standard industrial service where low weight, mechanical stability, and reasonable durability are required. The aluminium alloy housing helps keep overall weight down while still providing structural rigidity, and the nickel-plated shaft improves the surface condition of the rotary output element in regular factory environments.
The actuator is designed for operation with compressed air according to ISO 8573-1:2010 [7:-:-] and can work in an ambient temperature range from -10 °C to 60 °C. FESTO also notes that lubricated operation is possible, but once lubrication is used, it should continue to be used. In addition, the datasheet identifies cleanroom suitability measured according to ISO 14644-14, class 6 according to ISO 14644-1, along with LABS conformity to VDMA24364-B1/B2-L. These points make the actuator more attractive for controlled industrial environments where contamination behavior and material compatibility may matter.
Typical Applications
The DSM-16-270-P-A-B is suitable for a wide range of rotary tasks in factory automation. It can be used for part turning, gate or flap actuation, rotary stops, compact indexing functions, orientation changes in handling equipment, and switching mechanisms in packaging, assembly, test, and transfer systems. Its 270 degree movement range gives it an advantage in applications where a broader arc is needed, while its relatively low weight and compact body make it well suited for machines that cannot accommodate a larger rotary module. These application conclusions are consistent with the actuator’s published swivel range, torque, connection size, and compact mechanical configuration.
Conclusion
The FESTO 547574 DSM-16-270-P-A-B is a compact and practical semi-rotary drive for industrial automation systems that require reliable angular movement, moderate torque, and flexible installation. Its main strengths are the 0 to 270 degree swivel angle, double-acting vane design, 2.5 Nm theoretical torque at 6 bar, 470 g product weight, M5 connection, and compact female-thread mounting concept. For OEM builders, maintenance teams, and automation integrators looking for a proven FESTO rotary actuator for compact motion tasks, this model is a solid option with clear technical data and a straightforward application profile.
