Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X400
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X400 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, 400mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke400 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X400
The B04-SCD63X400 is an AirTAC construction-machinery dedicated double-rod cylinder. The B04- prefix indicates a heavy-equipment industry designation, meaning it is mechanically identical to the standard SCD63X400. It features a 63 mm bore and a 400 mm stroke, driven by a 20 mm diameter rod extending through both end caps.
Because the rod area is subtracted on both sides, thrust is perfectly symmetrical, yielding 1402 N of force in both directions at 0.5 MPa. The unit includes adjustable cushions with a 28 mm length to decelerate the piston near stroke ends. Note that air pressure must be maintained to hold a load; if static holding is required when exhausted, a mechanical lock or external brake is necessary.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X400 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 400 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-SCD63X400
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×400 | 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-SCD63X400 Is Used
Excavator Linkages
Drives symmetric push and pull movements on heavy equipment control surfaces where equal force both ways prevents linkage binding.
Shuttle Transfer Tables
Moves materials back and forth on construction machinery conveyors, using the dual rods to carry tooling on both ends simultaneously.
Non-Rotating Pushers
Pushes workpieces from alternating sides with high anti-rotation stability, leveraging the dual-rod guidance for precise alignment.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X400 the Right Cylinder?
This 63 mm bore provides 1402 N each way at 0.5 MPa. If your application requires less force, stepping down to a 50 mm bore yields 825 N. If you need more power, an 80 mm bore provides 2268 N. A single-rod SC cylinder is preferable if you only need one-sided actuation and want a shorter overall body length. For heavy side loads, a dedicated guided cylinder offers better load support than a through rod.
When replacing this cylinder, match five points: 63 mm bore, 400 mm stroke, PT1/4 port thread, basic mounting, and no magnet. The 400 mm stroke creates a long unsupported rod; use external guides to prevent rod bending and 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-SCD63X400 FAQ
The B04- prefix designates this as a construction-machinery dedicated variant. It is mechanically identical to the standard SCD63X400, offering the same 63 mm bore, 400 mm stroke, and 1402 N equal push/pull force at 0.5 MPa.
A double-rod cylinder provides identical push and pull forces because the 20 mm rod occupies both chambers. It also offers better anti-rotation characteristics and allows tooling or stoppers to be mounted on both extending ends, which a single-rod SC cylinder cannot do.
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