Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300 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, 300mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke300 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300
The B04-SCD50X300 is an AirTAC construction-machinery dedicated double-acting double-rod cylinder. The B04- prefix denotes it is mechanically identical to the standard SCD50X300, simply designated for heavy-equipment builders. It features a 50 mm bore and 300 mm stroke, delivering an equal 825 N of push and pull force at 0.5 MPa because the Ø20 mm piston rod passes through both end caps.
A through rod provides superior anti-rotation characteristics and allows tooling to mount on both ends, which is highly beneficial for synchronized shuttle movements. The cylinder body length A(SCD) is 207 mm, and it includes adjustable cushions with a 21 mm length to decelerate the piston near stroke ends. Note that the cushion only decelerates; it does not lock or hold the load if air pressure is lost.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 300 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-SCD50X300
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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-SCD50X300 Is Used
Excavator Linkage
Drives symmetric pushing and pulling actions on heavy-equipment control linkages where equal force in both directions is mandatory.
Shuttle Transfer
Moves parts between workstations on construction machinery assembly lines using dual tooling mounted on both rod ends.
Non-Rotating Pusher
Pushes heavy components straight without twisting, utilizing the enhanced guidance of the through-rod design.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300 the Right Cylinder?
This 50 mm bore offers 825 N of force each way at 0.5 MPa (1484 N at 0.9 MPa). If your construction machine needs less force, stepping down to the 40 mm bore yields 528 N. If you require heavier lifting, the 63 mm bore provides 1402 N. For applications without a need for rear-side tooling or symmetric loading, a single-rod AirTAC SC cylinder is a lighter, more compact alternative.
When operating at the 300 mm stroke, the unsupported rod length increases, raising the risk of rod bending under heavy side loads. Utilize an external guide rail or a dedicated guided cylinder to handle off-center loads. To replace this unit, match the 50 mm bore, 300 mm stroke, PT1/4 port thread, basic mounting, and confirm whether a magnetic piston (-S) 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-SCD50X300 FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant. It is mechanically and dimensionally identical to the standard SCD50X300, featuring the same 825 N equal push/pull force at 0.5 MPa and PT1/4 ports.
A double-rod cylinder provides identical push and pull forces (825 N each way at 0.5 MPa here) and better anti-rotation resistance. It allows tooling or a stopper to be mounted on the rear rod, making it ideal for symmetric shuttle applications in heavy machinery.
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