Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300 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-SCD40X300
The B04-SCD40X300 is an AirTAC double-acting, double-rod cylinder built for construction machinery. The B04- prefix marks it as a heavy-equipment dedicated variant, mechanically identical to the standard SCD40X300. A through-rod protrudes from both end caps, yielding identical thrust in both directions: 739 N at 0.7 MPa and 950 N at 0.9 MPa.
With a 300 mm stroke and a 16 mm rod on both ends, this 40 mm bore unit provides balanced bearing loading and anti-rotation benefits. The body length A(SCD) is 191 mm. Adjustable cushions at each end provide 21 mm of deceleration to protect the piston at stroke extremes.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300 |
|---|---|
| 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-SCD40X300
| 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-SCD40X300 Is Used
Excavator Linkages
Drives balanced two-sided actuation on heavy-equipment control surfaces where equal push and pull force is mandatory for stable linkage movement.
Shuttle Transfer Tables
Moves parts back and forth on construction-machinery assembly lines, using the rear rod for a stopper or sensor flag while maintaining identical speed both ways.
Non-Rotating Pushers
Pushes workpieces from both ends with high anti-rotation resistance, preventing tool deflection during heavy equipment component machining.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X300 the Right Cylinder?
Choose this 40 mm bore when an application demands 528 N of force each way at 0.5 MPa. If your machine requires less thrust, step down to the 32 mm bore (345 N at 0.5 MPa); for heavier loads, step up to the 50 mm bore (825 N at 0.5 MPa). A single-rod SC cylinder is preferable if you only need one-sided actuation and want to save space.
At 300 mm of stroke, the unsupported rod length increases the risk of bending under side loads. Use an external guide rail or a dedicated guided cylinder if the load is not perfectly axial. To replace this unit, match the 40 mm bore, 300 mm stroke, PT1/4 port, basic mounting, and no magnet.
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-SCD40X300 FAQ
The B04- prefix designates this as AirTAC's construction-machinery dedicated line. It is mechanically identical to the standard SCD40X300 double-rod cylinder, offering the same 40 mm bore, 300 mm stroke, and 739 N force at 0.7 MPa.
A double-rod cylinder provides equal push and pull force because the 16 mm rod area is subtracted from both chambers. This gives 528 N of force each way at 0.5 MPa. The through-rod also offers better guidance, anti-rotation control, and a rear extension for mounting tooling.
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