Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X800
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X800 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, 800mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke800 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X800
The B04-SCD40X800 is an AirTAC construction-machinery dedicated double-rod cylinder, mechanically identical to the standard SCD40X800. The B04- prefix simply designates its readiness for heavy-equipment builders without altering any physical specs. It features a 40mm bore and an 800mm stroke, driven by a Ø16mm piston rod extending through both end caps.
Because the rod occupies both chambers, the effective pressure area is identical in each direction, yielding an equal push and pull force of 739N at 0.7 MPa. The 800mm stroke is a standard length for this bore, and the tie-rod body incorporates 21mm adjustable cushions at both ends to decelerate the piston smoothly.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X800 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X800 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 800 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-SCD40X800
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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-SCD40X800 Is Used
Excavator Panel Shuttling
Drives two-sided panel actuation or material pushers on heavy equipment, utilizing the through-rod for symmetrical bearing loading and equal thrust in both directions.
Dual-Tool Transfer Mechanism
Mounts a tool on the front rod and a stopper or sensor flag on the rear rod, enabling synchronized material handling on construction machinery assembly lines.
Non-Rotating Pusher
Provides better resistance to rod twist than a single-rod cylinder during long-stroke pushing tasks, though an external guide is still recommended for true side-load absorption.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X800 the Right Cylinder?
This 40mm bore provides 528N of force each way at 0.5 MPa. If your construction mechanism requires less thrust, stepping down to a 32mm bore offers 345N, while a 50mm bore upgrades you to 825N for heavier loads. Choose a single-rod SC cylinder if you only need force in one direction and want a shorter overall body length.
At 800mm of stroke, the unsupported rod length is substantial. Avoid letting the rod absorb side loads or bending moments by using an external guide rail or a dedicated guided cylinder. For exact replacements, match the 40mm bore, 800mm stroke, PT1/4 port thread, basic mounting style, and confirm whether a magnetic piston (-S) is required.
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-SCD40X800 FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD40X800. It is mechanically identical to the standard AirTAC SCD40X800 double-rod cylinder, with the same 40mm bore, 800mm stroke, and 739N equal push/pull force at 0.7 MPa.
A double-rod cylinder provides identical push and pull forces (739N both ways at 0.7 MPa here) because the rod area is subtracted from both chambers. It also offers a rear rod for mounting secondary tooling or sensors and improves bearing symmetry, whereas a single-rod cylinder only has full force on the push side.
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