Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X500S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X500S 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, 500mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke500 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X500S
The B04-SCD50X500S is AirTAC's construction-machinery dedicated variant of the SCD50X500S double-acting, double-rod cylinder. The B04- prefix designates it for heavy-equipment builders, but mechanically it is identical to the standard SCD. It uses a 50 mm bore and a 500 mm stroke, yielding an equal push and pull force of 825 N at 0.5 MPa (1484 N at 0.9 MPa). Because the Ø20 mm piston rod passes through both end caps, the effective area is identical in both directions.
This through-rod design provides superior anti-rotation characteristics and allows tooling or stoppers to be mounted on the rear side. The 500 mm stroke is well within the 1200 mm maximum standard stroke for this bore. The barrel includes a built-in magnet (the S suffix), allowing CMSG, DMSG, or EMSG sensors to track piston position. Adjustable cushions at both ends provide 21 mm of deceleration to protect the end caps.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X500S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X500S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 500 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-SCD50X500S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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-SCD50X500S Is Used
Excavator Control Linkages
Drives symmetric push/pull mechanisms on heavy equipment where equal force both ways prevents linkage binding during hydraulic backup operations.
Shuttle Transfer Tables
Moves pallets or material carriers back and forth on construction-machinery assembly lines, using the dual rods to carry external stoppers at both ends.
Non-Rotating Tooling Actuators
Handles grippers or welding fixtures on heavy-duty jigs, leveraging the through-rod design for better anti-rotation resistance than a single-rod unit.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X500S the Right Cylinder?
Choose this 50 mm bore when an application requires exactly 825 N of thrust and pull simultaneously at 0.5 MPa. If your machine needs less force, stepping down to a 40 mm bore yields 528 N each way; if more power is required, a 63 mm bore provides 1402 N. For tasks that only need force in one direction and do not benefit from a rear rod, the single-rod AirTAC SC cylinder is a lighter, more compact alternative. For heavy side loads on the 500 mm stroke, a dedicated guided cylinder is recommended over relying solely on the through-rod bearing.
To replace this unit, match five points: 50 mm bore, 500 mm stroke, PT1/4 port thread, basic mounting (no bracket), and the built-in magnet (-S). The SCD mounting subset supports Basic, FA, LB, and TC styles, but excludes FB, CA, and CB. Note that air pressure alone does not hold a load; if the machine loses air, the piston will drift unless a mechanical lock or external brake is installed.
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-SCD50X500S FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated variant. It is mechanically identical to the standard SCD50X500S, offering the same 50 mm bore, 500 mm stroke, and 825 N equal push/pull force at 0.5 MPa.
The double-rod design provides identical push and pull forces (825 N at 0.5 MPa) because the rod area is subtracted on both sides. It also offers better rod guidance, anti-rotation resistance, and a rear rod for mounting secondary tooling or sensor flags.
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