557551

Name: Festo 557551 Semi-rotary actuator DFPB-20-090-S5-F05
Brand: Festo

Semi-rotary actuator DFPB-20-090-S5-F05

The Festo 557551 is a single-acting rack and pinion industrial component featuring a size 20 actuator, an F05 flange hole pattern, a 90-degree swivel angle, and an un-cushioned design configured for installation in any assembly position. It operates on compressed air conforming to ISO 8573-1:2010 [7:4:4] at a nominal working pressure of 5.6 bar and a maximum working pressure of 8 bar, featuring a NAMUR-standard valve connection based on VDI/VDE 3845 without position detection. Rated for Safety Integrity Level up to SIL 3 in Low Demand mode, this unit holds ATEX category II 2G and II 2D certifications with explosion-proof ambient temperatures ranging from -20°C to +80°C. Submit the exact part number, quantity, and application requirements to receive a formal quote.

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Manufacturer: Festo
Part number: 557551
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Technical Specifications

Size of actuator: 20
Flange hole pattern: F05
Swivel angle: 90 deg
Cushioning: No cushioning
Assembly position: Any
Mode of operation: single-acting
Design structure: Rack and pinion
Position detection: No
Valve connection conforms to standard: Based on VDI/VDE 3845 (NAMUR)
Safety Integrity Level (SIL): bis SIL 3 Low Demand mode
Working pressure: <= 8 bar
Nominal working pressure: 5.6 bar
ATEX category Gas: II 2G
Explosion ignition protection type Gas: c T4 X
ATEX category Dust: II 2D
Explosion ignition protection type Dust: c 125°C X
Explosion-proof ambient temperature: -20°C <= Ta <= +80°C
Ambient temperature: -20 ... 80 °C
Operating medium: Compressed air in accordance with ISO8573-1:2010 [7:4:4]
Note on operating and pilot medium: Lubricated operation possible (subsequently required for further | operation)
CE symbol (see declaration of conformity): according to EU-Ex protection guideline (ATEX)
Corrosion resistance classification CRC: 3
Note about the torque: Das Betriebsdrehmoment des Antriebs darf nicht höher sein als das in | der ISO 5211 aufgeführte maximal zulässige Drehmoment, bezogen auf | die Größe des Befestigungsflansches und der Kupplung.
PFD (Probability of Failure on Demand): 4.95E-06
Pneumatic connection: Subbase | G1/8
Materials note: Conforms to RoHS
Materials information for drive shaft: Wrought Aluminum alloy | Anodized
Materials information for cover: Aluminum die cast | coated
Materials information for seals: NBR
Materials information, housing: Wrought Aluminum alloy | Anodized
Materials information for nut: Wrought Aluminum alloy | Anodized
Screw material data: High alloy steel, non-corrosive

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Our sourcing response is prepared against Festo 557551. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.