Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125
The B04-SCD50X125 is an AirTAC construction-machinery dedicated double-rod cylinder. The B04- prefix marks it as a heavy-equipment variant that is mechanically identical to the standard SCD50X125, offering the same robust performance.
It features a 50 mm bore and 125 mm stroke, generating 1154 N of equal push and pull force at 0.7 MPa. A Ø20 mm piston rod passes through both end caps, providing symmetric bearing loading and anti-rotation stability. The body length A(SCD) is 207 mm, and adjustable cushions at both ends provide 21 mm of deceleration.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 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-SCD50X125
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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-SCD50X125 Is Used
Excavator Linkages
Drives symmetric positioning arms in heavy equipment where equal force is needed to push and pull hydraulic control valves.
Shuttle Transfer Tables
Moves parts across construction machinery assembly lines using the through-rod design to carry dual tooling on both ends.
Non-Rotating Pushers
Pushes and retracts heavy components with high anti-rotation resistance, leveraging the dual-rod guidance for precise placement.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125 the Right Cylinder?
Choose this 50 mm bore when an application demands 1154 N of thrust both ways at 0.7 MPa. If your machine requires less force, step down to the 40 mm bore which yields 739 N; if you need more power, the 63 mm bore provides 1962 N. For jobs needing only one-sided actuation, the single-rod AirTAC SC series is lighter and more compact.
When replacing this unit, match the 50 mm bore, 125 mm stroke, PT1/4 port thread, basic mounting, and no magnet. Because the stroke is 125 mm, side loads on the protruding rods should be managed with external guides to prevent premature bearing 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-SCD50X125 FAQ
The B04- prefix designates this as a construction-machinery dedicated variant of the SCD50X125. It is mechanically identical to the base model, offering the exact same bore, stroke, force, and port specifications for heavy-equipment builders.
No, the adjustable air cushion only decelerates the piston near the stroke end to prevent impact damage. It does not lock or hold the load. If the machine requires position holding without live air pressure, an external mechanical lock or pilot-operated check valve must be used.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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