Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X125
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X125 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. Ø63mm bore, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X125
The B04-SCD63X125 is an AirTAC construction-machinery dedicated double-acting, double-rod cylinder. The B04- prefix marks it as a heavy-equipment variant of the standard SCD63X125, meaning it shares the exact same physical specs and rugged build. Because the piston rod passes through both end caps, it delivers identical thrust and retraction force, outputting 1402 N in each direction at 0.5 MPa.
This 63 mm bore unit travels 125 mm and features a 20 mm diameter rod extending from both ends. The adjustable cushion strokes are 28 mm, ensuring smooth deceleration. With a body length A(SCD) of 210 mm, the overall retracted length is longer than a single-rod SC equivalent, but the through-rod design provides superior anti-rotation stability and allows tooling to be mounted on the rear side.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X125 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 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, 28 mm |
| Max stroke | Up to 1500 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 (Ø63mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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-SCD63X125
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | 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-SCD63X125 Is Used
Excavator Linkages
Drives symmetric push-pull mechanisms on heavy equipment where equal force in both directions prevents linkage binding.
Shuttle Transfer
Moves parts between stations on construction machinery assembly lines using dual-side tooling mounts on the through-rod.
Non-Rotating Pushers
Handles heavy workpiece positioning where the extended rear rod provides extra bearing support to resist twisting.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X125 the Right Cylinder?
Choose this 63 mm bore when an application demands 1402 N of force both ways at 0.5 MPa. If your machinery requires less thrust, stepping down to the 50 mm bore yields 825 N each way. For heavier loads requiring up to 2268 N in both directions, consider the 80 mm bore. A standard single-rod SC cylinder is preferable if you only need tooling on one end and want a shorter overall envelope, while a true guided cylinder is recommended for handling severe lateral loads.
To replace this unit, match the 63 mm bore, 125 mm stroke, PT1/4 port thread, basic mounting style, and confirm whether a magnetic piston is needed. Note that the adjustable air cushion only decelerates the piston near stroke end; it does not lock or hold the load. If the equipment must hold position without live air pressure, an external 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-SCD63X125 FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the standard SCD63X125. It is mechanically identical to the base model, offering the same 1402 N equal push and pull force at 0.5 MPa, but is designated for heavy-equipment builders.
A double-rod cylinder provides equal force and speed in both directions because the rod area is subtracted from both chambers. The through-rod design also improves anti-rotation characteristics and allows you to mount tooling or a sensor flag on the rear end, which a single-rod SC cylinder cannot do.
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