Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900S 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, 900mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke900 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900S
The B04-SCD50X900S is AirTAC's construction-machinery dedicated double-rod cylinder, mechanically identical to the standard SCD50X900S. The B04- prefix simply designates its readiness for heavy-equipment builders without altering any physical specs. It features a 50 mm bore and a 900 mm stroke, driven by a Ø20 mm piston rod that exits both end caps.
Because the rod occupies both chambers, the effective pressure area is identical in each direction, yielding an equal push and pull force of 825 N at 0.5 MPa and 1484 N at 0.9 MPa. The built-in magnet (-S) allows CMSG, DMSG or EMSG sensors to track piston position along the 207 mm body length A(SCD). Adjustable cushions provide 21 mm of end-of-stroke deceleration.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 900 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-SCD50X900S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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-SCD50X900S Is Used
Heavy Equipment Shuttle
Ideal for construction machinery feeders requiring equal force extending and retracting a 900 mm stroke to shuttle heavy components.
Dual-Tooling Transfer
The through-rod allows mounting a secondary tool or stopper on the rear side, enabling synchronized two-sided actuation on heavy-equipment assembly lines.
Extended Stroke Sensing
The built-in magnet pairs with CMSG/DMSG sensors to confirm position across the full 900 mm travel on long-reach excavator or loader mechanisms.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X900S the Right Cylinder?
Choose this 50 mm bore when an application demands 825 N of symmetrical thrust at 0.5 MPa. If your mechanism requires less force, stepping down to a 40 mm bore yields 528 N each way; if you need substantially more power, a 63 mm bore provides 1402 N. For tasks needing only one-sided actuation, the single-rod AirTAC SC series is a lighter, more compact alternative.
At 900 mm of stroke, the unsupported rod length is substantial. To prevent rod bending and premature bearing wear under side loads, use an external guide rail or select a dedicated guided cylinder instead of relying solely on the through-rod for support. To replace this unit, match the 50 mm bore, 900 mm stroke, PT port thread, basic mounting, and the -S magnet option.
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-SCD50X900S FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated variant. It is mechanically identical to the standard SCD50X900S double-rod cylinder, offering the same 825 N equal push/pull force at 0.5 MPa and PT porting, with no changes to dimensions or materials.
No. The 21 mm adjustable cushion only decelerates the piston near the stroke ends to prevent impact. It does not lock or hold the load. If the 900 mm stroke mechanism must maintain its position without live 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-SCD50X900S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.