Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250 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-SCD50X250
The B04-SCD50X250 is an AirTAC double-acting, double-rod cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the standard SCD50X250. Mechanically, it shares the exact same physical specifications, delivering an equal push and pull force of 1154 N at 0.7 MPa. The through-rod design protrudes from both end caps, providing superior rod guidance and anti-rotation characteristics essential for heavy-equipment actuation.
With a 250 mm stroke and a 20 mm rod diameter on both sides, this model achieves a maximum thrust of 1484 N at 0.9 MPa. It features adjustable cushions with a 21 mm length to decelerate the piston smoothly at stroke ends. The retracted body length is based on an A(SCD) dimension of 207 mm, making it longer than a comparable single-rod SC cylinder to accommodate the dual protruding rods.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250 |
|---|---|
| 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-SCD50X250
| 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-SCD50X250 Is Used
Excavator Linkage Control
Provides equal push and pull thrust for symmetrically actuating auxiliary linkage arms on heavy construction equipment without rotational play.
Shuttle Transfer Tables
Drives dual-sided material transfer shuttles where tooling is mounted on both rod ends to push and pull workpieces across a machinery bed.
Non-Rotating Pushers
Utilizes the through-rod guidance to push heavy construction components straight, preventing the rod from twisting under offset loads.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X250 the Right Cylinder?
Choose this 50 mm bore when an application demands identical force in both directions, offering 825 N at 0.5 MPa. If your construction machinery requires less force, stepping down to a 40 mm bore yields 528 N each way, while a 63 mm bore provides 1402 N for heavier loads. If the rear rod is unnecessary and you only need single-direction thrust, a standard AirTAC SC single-rod cylinder will save space and weight.
For a direct replacement, match the 50 mm bore, 250 mm stroke, PT1/4 port thread, basic mounting style, and non-magnet configuration. Because this cylinder features a 250 mm stroke, the extended unsupported rod is susceptible to bending under heavy side loads; always use an external guide rail or select a fully guided cylinder to prevent rod damage 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-SCD50X250 FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD50X250. It is mechanically identical to the base model, retaining the same 50 mm bore, 250 mm stroke, and 1154 N equal push/pull force at 0.7 MPa.
No, the adjustable cushion only decelerates the piston near the stroke end to prevent impact damage. It does not lock or hold the load. If the construction machinery requires position holding without live air pressure, an external mechanical lock or pilot-operated check valve must be installed.
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