Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225 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-SCD40X225
The B04-SCD40X225 is an AirTAC double-acting, double-rod cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the standard SCD40X225, sharing identical mechanical specifications. Because the Ø16 piston rod passes through both end caps, the effective area is equal in both chambers, generating an identical push and pull force of 739 N at 0.7 MPa.
This 225 mm stroke is a non-standard, made-to-order length for this 40 mm bore, extending beyond the standard 200 mm increment but well within the 1200 mm maximum. The through-rod design provides excellent anti-rotation characteristics and allows tooling to be mounted on the rear side. It features a PT1/4 port, 21 mm adjustable cushions at both ends, and a body length A(SCD) of 191 mm.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225 |
|---|---|
| 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-SCD40X225
| 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-SCD40X225 Is Used
Excavator Panel Indexing
Drives symmetric positioning of heavy cab panels on earthmoving equipment, utilizing the dual-rod design to prevent rotation during travel.
Shuttle Transfer Arms
Actuates two-sided tooling arms on heavy machinery transfer lines, ensuring equal push and pull velocity for stable material handling.
Crusher Feed Gates
Operates dual-sided flow control gates on mobile crushing machinery, relying on the equal 739 N force to clear blockages in either direction.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X225 the Right Cylinder?
Choose this 40 mm bore when an application requires 739 N of symmetric force at 0.7 MPa. If your construction equipment needs less thrust, the 32 mm bore offers 483 N; if more power is required, stepping up to the 50 mm bore provides 1154 N. A single-rod SC cylinder is preferable if rear tooling is unnecessary, while a true guided cylinder should be selected for heavy side loads.
For direct replacement, match the 40 mm bore, 225 mm stroke, PT1/4 thread, basic mounting, and magnet option. Since the 225 mm stroke creates a long unsupported rod, use an external guide rail to prevent rod bending under lateral stress. Note that air pressure loss will cause the piston to drift; a mechanical lock is required to hold loads 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-SCD40X225 FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant of the SCD40X225. It is mechanically identical to the standard double-rod cylinder, offering the same 40 mm bore, 225 mm stroke, and 739 N equal push/pull force at 0.7 MPa.
A double-rod cylinder provides identical push and pull forces because the rod area is subtracted from both sides. It also offers better rod guidance, anti-rotation resistance, and a rear extension for mounting secondary tooling or sensors, which a single-rod SC cylinder cannot provide.
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