Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225S 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, 225mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke225 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225S
The B04-SCD40X225S is an AirTAC double-acting, double-rod cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the standard SCD40X225S. Mechanically, it shares the exact same physical specifications, offering a 40 mm bore and a 225 mm stroke. Because the piston rod passes through both end caps, the effective pressure area is identical in both directions, yielding an equal push and pull force of 528 N at 0.5 MPa and 950 N at the 0.9 MPa maximum operating pressure.
This through-rod design provides superior rod guidance and anti-rotation characteristics compared to a single-rod cylinder, which is critical for rugged heavy-equipment environments. The cylinder features a Ø16 mm rod on both ends, M12x1.25 rod threads, and PT1/4 ports. It includes adjustable cushions with a 21 mm length to decelerate the piston near the stroke ends, and the built-in magnet (-S suffix) allows CMSG or DMSG sensors to track position along the barrel.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 225 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-SCD40X225S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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-SCD40X225S Is Used
Heavy Equipment Actuation
Drives symmetric push/pull mechanisms on construction machinery where equal force both ways prevents mechanical binding.
Shuttle Transfer
Moves parts or materials between two stations using tooling mounted on both rod ends for balanced load distribution.
Non-Rotating Tooling
Handles applications requiring high anti-rotation resistance, using the dual-rod structure to keep grippers or stops perfectly aligned.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225S the Right Cylinder?
Choose this 40 mm bore when an application requires 739 N of thrust at 0.7 MPa in both directions. If your construction machinery needs less force, stepping down to a 32 mm bore provides 483 N at 0.7 MPa; if more power is required, a 50 mm bore offers 1154 N at 0.7 MPa. A single-rod SC cylinder is preferable if you only need unidirectional thrust and want a shorter overall body length, as the SCD body length A is 191 mm.
For stroke lengths of 225 mm, the unsupported rod length is moderate, but external side loads can still cause rod bending over time; using an external guide rail ensures optimal life. When replacing this unit, match the 40 mm bore, 225 mm stroke, PT1/4 port thread, basic mounting, and the built-in magnet (-S). Note that air pressure does not hold the load if the valve is centered or pressure is lost; a mechanical lock or external rod brake is required to hold a load safely.
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-SCD40X225S FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD40X225S. It is mechanically identical to the standard AirTAC SCD40X225S double-rod cylinder, offering the same 40 mm bore, 225 mm stroke, and 950 N force at 0.9 MPa.
A double-rod cylinder provides equal push and pull force (739 N at 0.7 MPa for this 40 mm bore) because the rod area is subtracted from both chambers. The through-rod also offers better anti-rotation control and allows you to mount tooling or a sensor flag on the rear side.
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