Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD80X900
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD80X900 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø25mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø80mm bore, 900mm stroke, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Rod (both ends)Ø25 mm
- Stroke900 mm
- Port sizePT3/8
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD80X900
The B04-SCD80X900 is AirTAC's construction-machinery dedicated variant of the standard SCD80X900 double-acting, double-rod cylinder. The B04- prefix designates it for heavy-equipment builders, but mechanically it is identical to the base model, offering a 900 mm stroke and a robust 80 mm bore.
Because the piston rod passes through both end caps, the effective area is equal in both chambers, yielding an identical push and pull force of 3175 N at 0.7 MPa. A Ø25 mm rod protrudes from both ends, utilizing 28 mm adjustable cushions to decelerate the payload at stroke extremes. The retracted body length is based on an A(SCD) dimension of 257 mm, which is longer than a single-rod SC equivalent.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD80X900 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD80X900 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø80 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 900 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 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 (Ø80mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2268 N | 2268 N |
| 0.7 MPa | 3175 N | 3175 N |
| Max (@1.0 MPa) | 463 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-SCD80X900
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 80 | Bore size in mm. |
| ×900 | 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-SCD80X900 Is Used
Excavator Linkage Control
Drives symmetric positioning of heavy mechanical linkages on earthmoving equipment, utilizing the rear rod for a counterbalancing stopper.
Material Shuttle Transfer
Moves construction aggregates between processing stations with equal push and pull velocity, preventing sudden deceleration jerks.
Dual-Sided Forming Press
Actuates clamping or forming tools from both ends simultaneously, ensuring parallel actuation across heavy-duty fabrication dies.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD80X900 the Right Cylinder?
This 80 mm bore provides 2268 N of force at 0.5 MPa. If your construction equipment requires less thrust, stepping down to a 63 mm bore yields 1402 N at 0.5 MPa; if you need more power, a 100 mm bore provides 3681 N at 0.5 MPa. For applications where you only need tooling on one side and want maximum thrust, a single-rod SC cylinder is a better choice.
With a 900 mm stroke, the unsupported rod length is substantial. To prevent rod bending and premature bearing wear under side loads, use an external guide rail or select a dedicated guided cylinder instead of relying solely on the through-rod for support. When replacing this unit, match the 80 mm bore, 900 mm stroke, PT3/8 port thread, basic mounting, and ensure no magnet 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-SCD80X900 FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated line. It is mechanically identical to the standard SCD80X900, offering the same 80 mm bore, 900 mm stroke, and 3175 N force at 0.7 MPa, simply designated for heavy-equipment manufacturing.
No, the 28 mm adjustable cushions only decelerate the piston near the end of the stroke to reduce impact. If the equipment must hold a load without live air pressure, you must use an external rod brake, mechanical lock, or pilot-operated check valve.
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