Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 900mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke900 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900
The B04-SCD50X900 is an AirTAC double-acting, double-rod cylinder where the leading B04- prefix designates it as a construction-machinery dedicated variant of the standard SCD50X900. Mechanically identical to the base model, it provides 825 N of thrust in both directions at 0.5 MPa because the Ø20 rod extends through both end caps, equalizing the effective pressure area.
With a 900 mm stroke, this unit suits long-travel material handling on heavy equipment. It features a PT1/4 port, 21 mm adjustable cushions at both ends, and a body length A(SCD) of 207 mm. The through-rod design enhances bearing load symmetry and provides anti-rotation stability for dual-tooling setups.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 900 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCD (double-rod) datasheet. Because the rod runs through both caps, the effective area is (bore² − rod²) in both directions. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 kgf | |
Push and pull are EQUAL on a double-rod cylinder — both chambers lose the rod area, so effective area = (bore² − rod²) each way. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCJ (adjustable stroke), SCT (multi-position). SCD mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900 Is Used
Excavator Actuation
Drives long-travel auxiliary covers or sorting grates on earthmoving equipment, utilizing the symmetric thrust for reliable bidirectional cycling.
Material Shuttle
Moves heavy components along an assembly line, where the rear rod can mount a stopper flag or secondary tooling to synchronize operations.
Dual-Side Pusher
Pushes workpieces from both ends simultaneously, ensuring balanced force distribution without requiring two separate single-rod actuators.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900 the Right Cylinder?
This 50 mm bore provides 825 N each way at 0.5 MPa; step down to a 40 mm bore for 528 N if the load is lighter, or up to a 63 mm bore for 1402 N if your construction mechanism requires greater thrust. If you only need force in one direction, a single-rod SC cylinder saves space. For exact replacements, match the 50 mm bore, 900 mm stroke, PT1/4 thread, basic mounting, and confirm whether a magnetic piston (-S) is needed.
At 900 mm of travel, the unsupported rod is highly susceptible to bending under side loads. For heavy construction machinery applications, always pair this cylinder with an external guide rail or use a fully guided cylinder to prevent rod damage and premature seal wear.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900 FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD50X900. It is mechanically identical to the standard model, offering the same 825 N equal push and pull force at 0.5 MPa, but is designated for heavy-equipment builders.
No, the 21 mm adjustable cushions only decelerate the piston near the end of the 900 mm stroke to prevent impact. If your application must hold a load without live air pressure, you must use an external mechanical lock or pilot-operated check valve.
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