Airtac SCD Standard Cylinder SCD50X1240
The AirTAC Airtac SCD Standard Cylinder SCD50X1240 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, 1240mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 mm
- Stroke1240 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD50X1240
The SCD50X1240 is a double-acting, double-rod pneumatic cylinder that outputs an identical 825 N of thrust in both directions at 0.5 MPa because the 20 mm rod passes through both end caps, cancelling the area difference. This 50 mm bore unit with a long 1240 mm stroke is often chosen when a rear rod extension is needed to mount a limit switch dog, a secondary tool, or a manual override knob.
At the full 0.9 MPa operating pressure, each stroke delivers 1484 N. The cylinder body measures 207 mm (A dimension) and the retracted length is substantially longer than an equivalent single-rod SC due to the rod protruding from the rear. Adjustable air cushioning on both ends decelerates the piston over the final 21 mm of travel, and the PT1/4 ports keep flow paths consistent with standard AirTAC fittings.
Airtac SCD Standard Cylinder SCD50X1240 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD50X1240 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 1240 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 SCD Standard Cylinder SCD50X1240
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×1240 | 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 SCD Standard Cylinder SCD50X1240 Is Used
Bidirectional Transfer Shuttles
The equal push-pull force of 825 N at 0.5 MPa makes the SCD50X1240 ideal for shuttle tables that move a pallet or fixture back and forth with the same speed and thrust in each direction.
Rear-Mounted Stroke Sensing
The rear rod extension on this 1240 mm stroke cylinder provides a convenient place to attach a cam or flag for external proximity sensors, keeping the front tooling area clear.
Symmetric Clamping & Pressing
Use the through-rod to drive two opposing clamp arms simultaneously from a single cylinder, ensuring perfectly synchronized motion without complex linkages.
Is the Airtac SCD Standard Cylinder SCD50X1240 the Right Cylinder?
If 825 N per stroke is slightly below the continuous demand, stepping up to the 63 mm bore SCD63 provides 1402 N at the same 0.5 MPa. For applications that only need force in one direction, the single-rod SC50 series saves space and cost. Because the 1240 mm stroke exceeds the standard maximum of 1200 mm for this bore, this is a non-standard, made-to-order length. On such a long unsupported stroke, consider an external linear guide or switch to a guided cylinder if the rod sees any side load, as the through-rod alone improves bearing alignment but does not eliminate bending risk.
When replacing an existing SCD50X1240, match the bore, the 1240 mm stroke, the PT port thread, and the mounting style. If the original carried a magnet suffix (-S), the replacement must also include it to retain sensor compatibility.
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 SCD Standard Cylinder SCD50X1240 FAQ
Push and pull force are identical because the rod extends through both ends. At 0.5 MPa it produces 825 N, at 0.7 MPa it produces 1154 N, and at the maximum operating pressure of 0.9 MPa it delivers 1484 N in both directions.
Choose the SCD when you need equal force and speed in both directions, or when you need a rear rod extension to mount tooling, a stopper bolt, or a sensor target. The through-rod also provides better support for the piston and can reduce rod deflection compared to a single-rod cylinder of the same stroke.
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