Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400 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, 400mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke400 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400
The B04-SCD50X400 is AirTAC's construction-machinery dedicated variant of the standard SCD50X400 double-rod cylinder, sharing identical mechanical specifications. The B04- prefix simply designates its application focus for heavy-equipment builders, meaning it provides the same robust performance as the base model.
Featuring a 50 mm bore and 400 mm stroke, this double-acting cylinder generates 825 N of force in both directions at 0.5 MPa. The Ø20 mm piston rod passes through both end caps, ensuring identical push and pull thrust while offering superior anti-rotation characteristics. It includes adjustable cushions with a 21 mm length and has a body length A(SCD) of 207 mm.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 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, 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-SCD50X400
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | 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-SCD50X400 Is Used
Excavator Control Linkages
Provides equal push and pull thrust for moving heavy counterbalance valves or auxiliary linkage components on earthmoving equipment.
Material Shuttle Transfer
The through-rod design supports tooling on both ends, allowing a construction-machinery assembly line to push and pull heavy chassis frames symmetrically.
Non-Rotating Hydraulic Clamps
Dual rod guidance prevents piston rotation, ensuring precise alignment when clamping uneven steel plates for welding on heavy machinery frames.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400 the Right Cylinder?
This 50 mm bore provides 825 N each way at 0.5 MPa, making it a solid step up from the 32 mm bore (345 N) if your construction mechanism needs more clamping or lifting force. If your application only requires one-way actuation, the single-rod AirTAC SC50X400 is lighter and more compact. For heavy side loads, a dedicated guided cylinder is recommended over a through rod.
When ordering a replacement, match the 50 mm bore, 400 mm stroke, PT1/4 port thread, basic mounting style, and confirm whether a magnetic piston (-S) is needed. Since the stroke is 400 mm, the unsupported rod is susceptible to bending under lateral stress; always use an external guide rail to manage side loads.
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-SCD50X400 FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated variant of the SCD50X400. It is mechanically identical to the standard SCD50X400 double-rod cylinder, offering the same 50 mm bore, 400 mm stroke, and 825 N equal push/pull force at 0.5 MPa.
No, the adjustable cushion only decelerates the piston near the stroke ends to reduce impact. If your construction equipment must hold a load without continuous air pressure, you must use an external mechanical lock, rod brake, or pilot-operated check valve.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCD Double-Rod Cylinders
Request a Quote for Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X400
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.