Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250S 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, 250mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke250 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250S
The B04-SCD50X250S is AirTAC's construction-machinery dedicated variant of the SCD50X250S double-rod cylinder, sharing the exact same physical specs. The B04- prefix simply marks it for heavy-equipment builders. Because the piston rod passes through both end caps, the effective area is identical in both chambers, yielding an equal 825 N of push and pull force at 0.5 MPa.
This 50 mm bore unit features a 20 mm rod on both ends and a 250 mm stroke. The adjustable cushion stroke is 21 mm, and the retracted body length A(SCD) is 207 mm. A built-in magnet is included, allowing CMSG or DMSG sensors to track piston position along the barrel.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 250 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-SCD50X250S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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-SCD50X250S Is Used
Excavator Panel Pusher
Equal push and pull force is ideal for moving heavy cab panels or covers on construction machinery without asymmetric speed shifts.
Shuttle Transfer Unit
The through rod allows mounting a stopper block on the rear side to act as a mechanical shuttle for material transfer on heavy equipment.
Non-Rotating Actuator
Dual rods provide better resistance to torsional twisting than single-rod types, ensuring tools stay aligned during compact equipment assembly.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250S the Right Cylinder?
At 0.5 MPa, this bore provides 825 N each way. If your application requires less force, stepping down to a 40 mm bore yields 528 N, while moving up to a 63 mm bore provides 1402 N. If you only need thrust in one direction and want to save space, a single-rod SC cylinder is a better choice. For heavy side loads, a dedicated guided cylinder is recommended over relying on the through rod.
To replace this unit, match the 50 mm bore, 250 mm stroke, PT1/4 port thread, basic mounting, and the -S magnet option. Since the stroke is 250 mm, support the external rod to prevent bending under load.
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-SCD50X250S FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated line. It is mechanically identical to the standard SCD50X250S double-rod cylinder, with no changes to bore, force, or seals.
No, the adjustable cushion only decelerates the piston near the stroke end. It does not lock or hold the load. If you need to hold a load without live air pressure, you must use an external 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-SCD50X250S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.