Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350 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, 350mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke350 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350
The B04-SCD40X350 is an AirTAC construction-machinery dedicated double-acting, double-rod cylinder. The B04- prefix marks it as a heavy-equipment builder variant, mechanically identical to the standard SCD40X350. It features a 40 mm bore and 350 mm stroke, delivering 528 N of equal push and pull force at 0.5 MPa.
A Ø16 mm piston rod passes through both end caps, providing 739 N of thrust in both directions at 0.7 MPa. The through-rod design ensures symmetric bearing loads and better anti-rotation resistance than a single-rod unit. It uses adjustable cushions (21 mm) and PT1/4 ports, with a standard operating temperature range of -20 to +70 C.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 350 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-SCD40X350
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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-SCD40X350 Is Used
Excavator Linkages
Drives auxiliary covers or locking pins on heavy equipment where equal force is needed to extend and retract the mechanism.
Shuttle Transfer
Moves parts between stations on construction machinery assembly lines, using the rear rod for a stopper or sensor flag.
Non-Rotating Pushers
Pushes workpieces from both sides. The double-rod design improves guidance and resists twist compared to single-rod options.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350 the Right Cylinder?
Choose this 40 mm bore when an application requires 528 N of bidirectional force at 0.5 MPa. If your machine needs less output, step down to the 32 mm bore (345 N); for heavier loads, step up to the 50 mm bore (825 N). If you only need force in one direction and want a shorter body, the single-rod SC40X350 is a better fit. For high side loads, select a guided cylinder instead of relying on the through rod.
At 350 mm of stroke, the unsupported rod length increases bending risk under lateral loads. Use external guides to manage side forces. To replace this unit, match the 40 mm bore, 350 mm stroke, PT1/4 port thread, basic mounting, and no magnet. The max standard stroke for this bore is 1200 mm.
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-SCD40X350 FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant of the SCD40X350. It is mechanically identical to the standard SCD model, offering the same 40 mm bore, 350 mm stroke, and 528 N equal push/pull force at 0.5 MPa.
A double-rod cylinder provides identical push and pull forces (528 N each way at 0.5 MPa here) because the rod area is subtracted from both chambers. The through-rod offers better anti-rotation characteristics and allows tooling or sensors to be mounted on the rear side.
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