Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 300mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke300 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300S
The B04-SCD40X300S is an AirTAC double-acting, double-rod cylinder engineered for construction machinery. The B04- prefix designates this as a construction-machinery dedicated variant of the standard SCD40X300S; mechanically, every physical specification matches the base model exactly. A Ø16 mm piston rod protrudes from both end caps, yielding identical thrust in both directions at 739 N (0.7 MPa) and 950 N at the 0.9 MPa maximum operating pressure.
Because the rod travels through both ends, the effective area is balanced, providing smooth bidirectional motion for heavy-equipment shuttle mechanisms. This 300 mm stroke unit includes a built-in magnet for CMSG/DMSG/EMSG sensor tracking along the 191 mm body length A(SCD). The standard adjustable cushion extends 21 mm at each end to decelerate the piston near the stroke limits.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 300 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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-SCD40X300S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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-SCD40X300S Is Used
Excavator Shuttle Mechanisms
Drives bidirectional transfer arms on heavy equipment where equal push and pull force is required to move components reliably in both directions.
Dual-Tooling Actuation
Mounts a tool on one rod end and a stopper or sensor flag on the opposite end, keeping bearing loads symmetric for construction machinery panels.
Material Transfer Tables
Synchronizes push-pull cycles on aggregate or material handling conveyors, utilizing the built-in magnet for end-of-stroke position confirmation.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300S the Right Cylinder?
Choose this 40 mm bore when an application demands 739 N of force in both directions at 0.7 MPa. If your mechanism requires less thrust, stepping down to the 32 mm bore yields 483 N under the same pressure. For higher force needs without increasing the envelope drastically, the 50 mm bore provides 1154 N. A single-rod SC cylinder is preferable if rear rod tooling or anti-rotation guidance is unnecessary, while a true guided cylinder is advised for heavy off-center loads.
With a 300 mm stroke, the unsupported rod length increases, raising the risk of rod bending under side loads. Utilize external guide rails or a guided cylinder to manage deflection. For exact replacements, match the 40 mm bore, 300 mm stroke, PT1/4 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-SCD40X300S FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant of the SCD40X300S. It is mechanically identical to the base model, offering the same 40 mm bore, 300 mm stroke, and 739 N force at 0.7 MPa.
Yes, because the rod occupies volume on both sides of the piston, the push and pull forces are equal. This cylinder generates 528 N at 0.5 MPa and 739 N at 0.7 MPa in both directions.
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