Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X25
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X25 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, 25mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke25 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X25
The B04-SCD40X25 is an AirTAC double-acting, double-rod cylinder where the leading B04- prefix designates it as a construction-machinery dedicated variant of the standard SCD40X25. Mechanically, it is identical to the base model, featuring a 40mm bore and a short 25mm stroke. Because the piston rod passes through both end caps, the effective area is identical in both directions, yielding an equal push and pull force of 528N at 0.5 MPa and 739N at 0.7 MPa.
This symmetric design is highly valued in heavy-equipment actuation where space is tight but bidirectional reliability is required. The through-rod configuration uses a 16mm diameter rod on both ends and features adjustable cushions with a 21mm length to decelerate the piston near stroke ends. Note that the overall retracted length is longer than a single-rod SC cylinder of equivalent size, utilizing a 191mm body length A(SCD).
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X25 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X25 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 25 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-SCD40X25
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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-SCD40X25 Is Used
Excavator Control Levers
Provides symmetric, equal-force bidirectional shifting for secondary pilot valves on heavy earthmoving equipment.
Bidirectional Gate Actuation
Drives compact flow-control flaps on concrete mixers where identical push and pull speeds are necessary.
Dual-Tool Positioning
Mounts a stopper or secondary tool on the rear rod extension to synchronize two mechanisms in tight machinery bays.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X25 the Right Cylinder?
Choose this 40mm bore when an application demands exactly 528N of thrust each way at 0.5 MPa within a minimal footprint. If your mechanism requires less force, stepping down to a 32mm bore provides 345N, while upgrading to a 50mm bore offers 825N for heavier loads. For tasks needing only one-sided actuation, the single-rod AirTAC SC40X25 is a lighter, more compact alternative.
Because the stroke is only 25mm, rod bending is minimal, but a proper guided cylinder remains necessary if the load imposes significant side torque. To replace this unit, match the 40mm bore, 25mm stroke, PT1/4 port thread, basic mounting style, and ensure no internal magnet is required. The adjustable air cushion only decelerates the piston; it does not lock or hold the load when air pressure is removed.
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-SCD40X25 FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the standard AirTAC SCD40X25. It is mechanically identical to the base double-rod cylinder, offering the same 40mm bore, 25mm stroke, and 739N force at 0.7 MPa, specifically designated for heavy-equipment builders.
Yes, because the rod occupies volume on both sides of the piston, the push and pull forces are equal. The B04-SCD40X25 generates 528N in both directions at 0.5 MPa, rather than having a stronger full-bore push like a single-rod cylinder.
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