Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X200
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X200 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 200mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke200 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X200
The B04-SCD40X200 is an AirTAC double-acting, double-rod pneumatic cylinder built for construction machinery. The B04- prefix marks it as a construction-dedicated variant of the standard SCD40X200, meaning it is mechanically identical to the base model. It features a 40mm bore and a 200mm stroke, delivering an equal push and pull force of 739 N at 0.7 MPa because the 16mm piston rod extends through both end caps.
This symmetric design provides 950 N of thrust at 0.9 MPa, utilizing adjustable cushions that extend 21mm at each end to decelerate the piston smoothly. With a body length A(SCD) of 191mm and PT1/4 ports, it offers superior rod guidance and anti-rotation characteristics compared to single-rod alternatives, making it highly reliable for heavy-equipment actuation.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X200 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X200 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 200 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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-SCD40X200
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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-SCD40X200 Is Used
Excavator Control Linkages
Provides equal push and pull force for pilot valve actuation panels where symmetric loading and reliable anti-rotation are critical for precise machinery control.
Shuttle Gate Transfer
Drives two-sided material routing gates on crushing and screening plants, using the through-rod to mount a secondary stopper or mechanical flag.
Boom Positioning Stops
Acts as a non-rotating pusher for adjustable mechanical stops on heavy equipment booms, ensuring stable alignment under harsh operating conditions.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X200 the Right Cylinder?
Choose this 40mm bore when your application requires 739 N of force in both directions and a 200mm stroke. If your mechanism needs less force, stepping down to a 32mm bore yields 483 N at 0.5 MPa. If higher thrust is required, a 50mm bore provides 825 N at 0.5 MPa. A single-rod SC cylinder is preferable if rear tooling is unnecessary, while a guided cylinder is recommended for heavy side loads.
At 200mm stroke, the unsupported rod length is moderate, but external guides should still be used to prevent rod bending under offset loads. Replacement requires matching the 40mm bore, 200mm stroke, PT1/4 port thread, basic mounting, and no magnet. Note that the adjustable air cushion only decelerates the piston near stroke end; it does not lock or hold the load. If the mechanism must maintain position without live air pressure, a mechanical lock or pilot-operated check valve is required.
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-SCD40X200 FAQ
The B04- prefix designates this as a construction-machinery dedicated variant of the SCD40X200. It is mechanically identical to the standard model, offering the same 40mm bore, 200mm stroke, and 739 N equal push/pull force at 0.7 MPa, simply designated for heavy-equipment builders.
A double-rod cylinder provides identical push and pull forces because the 16mm rod area is subtracted from both chambers. The through-rod also offers better anti-rotation resistance and allows tooling or sensors to be mounted on the rear side, which is ideal for compact construction machinery layouts.
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