Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 300mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 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-SCD50X300S
The B04-SCD50X300S is an AirTAC double-acting, double-rod pneumatic cylinder built for construction machinery. The B04- prefix marks it as a heavy-equipment dedicated variant of the SCD50X300S, meaning it is mechanically identical to the standard model. It features a 50 mm bore, a 300 mm stroke, and a built-in magnet for position sensing.
Because the piston rod passes through both end caps, the effective area is identical in both directions. This yields an equal push and pull force of 825 N at 0.5 MPa, and 1484 N at 0.9 MPa. A Ø20 mm rod protrudes from both ends, supported by adjustable cushions that are 21 mm long to absorb impact at stroke ends.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 300 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 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 (Ø50mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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-SCD50X300S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | 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-SCD50X300S Is Used
Excavator Linkages
Drives symmetric positioning arms on heavy equipment where equal push and pull thrust is required to move linkage components through harsh environments.
Shuttle Transfer Tables
Moves fixtures back and forth on a conveyor using both rod ends, ensuring balanced velocity and identical force during material transport.
Non-Rotating Pushers
Pushes workpieces from both sides simultaneously. The through-rod design adds extra bearing support to resist twisting compared to a single-rod unit.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X300S the Right Cylinder?
Choose this 50 mm bore when an application requires 825 N of symmetric force each way. If your machine needs less thrust, the 40 mm bore provides 528 N; if you need more, the 63 mm bore offers 1402 N. A single-rod SC cylinder is preferable if you only need force in one direction and want a shorter overall body length.
At 300 mm of stroke, the unsupported rod length increases. Minimize side loading on the rod by using an external guide rail or a dedicated guided cylinder to prevent bending. For direct replacements, match the 50 mm bore, 300 mm stroke, PT1/4 port, basic mounting, and the -S magnet option.
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-SCD50X300S FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant. It is mechanically identical to the standard SCD50X300S, offering the exact same 50 mm bore, 300 mm stroke, and 825 N force at 0.5 MPa.
Yes, it equalizes it. Because the rod occupies volume on both sides of the piston, the push and pull forces are identical at 825 N (0.5 MPa) and 1484 N (0.9 MPa). The cushion only decelerates the piston at end strokes; it does not lock or hold the load without air pressure.
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