Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X25S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X25S 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, 25mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke25 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X25S
The B04-SCD50X25S is AirTAC's construction-machinery dedicated variant of the standard SCD50X25S double-acting, double-rod cylinder. The B04- prefix designates it for heavy-equipment builders, but mechanically it is identical to the base model, offering a 50 mm bore and a short 25 mm stroke. Because the piston rod passes through both end caps, the effective area is equal in both chambers, yielding an identical push and pull force of 825 N at 0.5 MPa.
This symmetric design is ideal for compact jobs requiring non-rotating dual-tooling actuation. A Ø20 mm rod protrudes from both ends, and the unit features a built-in magnet (indicated by the S suffix) so CMSG, DMSG, or EMSG sensors can clamp directly onto the barrel for position signaling. The adjustable cushion length is 21 mm, and the overall retracted body length A(SCD) is 207 mm.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X25S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X25S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 25 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-SCD50X25S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×25 | 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-SCD50X25S Is Used
Excavator Control Linkages
Provides equal push and pull force for symmetric pilot valve actuation on heavy equipment, ensuring precise bidirectional shifting in harsh environments.
Shuttle Transfer Stops
Uses the rear rod extension as a mechanical stopper while the front rod pushes, maintaining balanced bearing loads on compact construction machinery indexing stations.
Dual-Tool Positioning
The built-in magnet allows solid-state sensors to track the short 25 mm stroke, confirming tool engagement for heavy-duty material handling grips.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X25S the Right Cylinder?
Choose this 50 mm bore when an application demands exactly 825 N of thrust and pull simultaneously within a tight 25 mm travel envelope. If your machine requires less force, stepping down to a 40 mm bore yields 528 N each way; if more power is needed, a 63 mm bore provides 1402 N at 0.5 MPa. For tasks needing only one-sided pushing, the standard single-rod AirTAC SC cylinder is lighter and more compact.
When replacing this unit, match the 50 mm bore, 25 mm stroke, PT1/4 port thread, basic mounting style, and the -S magnetic option. Although the through rod provides better guidance and anti-rotation than a single rod, it is not a substitute for a true guided cylinder under heavy side loads. Note that air pressure must be maintained to hold a load; if the valve is centered or pressure drops, the piston will drift and an external rod brake 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-SCD50X25S FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD50X25S. It is mechanically identical to the standard AirTAC SCD double-rod cylinder, featuring the same 50 mm bore, 25 mm stroke, and 825 N equal push/pull force at 0.5 MPa.
A double-rod cylinder provides identical thrust and pull forces because the rod area is subtracted from both sides. It also offers better anti-rotation characteristics, allows tooling to be mounted on both ends, and symmetrically loads the bearings, which is crucial for stable heavy-equipment actuation.
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