Airtac SCD Standard Cylinder SCD100X550
The AirTAC Airtac SCD Standard Cylinder SCD100X550 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. Ø100mm bore, 550mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Rod (both ends)Ø25 mm
- Stroke550 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 29 mm
About the Airtac SCD Standard Cylinder SCD100X550
The SCD100X550 is a double-acting, double-rod pneumatic cylinder that outputs identical force in both directions, calculated from the annular area of its 100 mm bore and 25 mm through-rod. At a typical 0.5 MPa supply, you get 3681 N of thrust whether extending or retracting, rising to 6626 N at the maximum operating pressure of 0.9 MPa. This symmetry eliminates force differentials that can complicate tooling design, making the cylinder ideal for transfer shuttles, dual-sided fixtures, or any mechanism where the rear rod extension carries a sensor flag or secondary tool.
With a 550 mm stroke, this model stays within the standard stroke range for the 100 mm bore, which supports up to 1500 mm. The body length A(SCD) is 263 mm, and the adjustable air cushion at each end (29 mm cushion length) decelerates the piston smoothly to reduce end-of-stroke impact. The rod protrudes from both end caps with an M20x1.5 male thread, and the PT1/2 ports supply filtered air. This genuine AirTAC tie-rod cylinder is built for reliable double-ended actuation in industrial automation.
Airtac SCD Standard Cylinder SCD100X550 Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD100X550 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø100 mm |
| Rod diameter | Ø25 mm (both ends) |
| Stroke | 550 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| 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, 29 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 (Ø100mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3682 N | 3682 N |
| 0.7 MPa | 5154 N | 5154 N |
| Max (@1.0 MPa) | 751 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 SCD100X550
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 100 | Bore size in mm. |
| ×550 | 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 SCD100X550 Is Used
Bidirectional Transfer Shuttles
The equal 3681 N push and pull force at 0.5 MPa makes the SCD100X550 perfect for shuttling parts between two stations. The rear rod can carry a counterbalance or a second tool, doubling throughput without adding a second cylinder.
Non-Rotating Pusher Mechanisms
With a rod extending from both ends, the dual-bearing support provides inherent anti-rotation stability. Use it to push components onto a conveyor or into a fixture where rod twist cannot be tolerated, eliminating the need for an external anti-rotate bracket.
Rear-Mounted Stroke Sensing
The 25 mm rear rod extension is an ideal mounting point for a sensor flag or a mechanical stop. This allows you to place reed or solid-state sensors on the rear end cap without interfering with the primary tooling on the front rod, keeping the workspace clean.
Is the Airtac SCD Standard Cylinder SCD100X550 the Right Cylinder?
Choose the SCD100 when your application needs balanced bidirectional force around 3700 N at 0.5 MPa. If your load is lighter, stepping down to the SCD80 bore drops the force to 2268 N at the same pressure, which may allow a smaller footprint and lower air consumption. For heavier demands, the SCD125 provides 5734 N. Remember that a double-rod cylinder provides better guidance than a single-rod SC series, but it is not a guided cylinder; at a 550 mm stroke, ensure the rod is not subjected to significant side load. If the load is off-centre, pair the cylinder with an external linear guide or switch to a dedicated guided cylinder to prevent rod bending and premature seal wear.
For a drop-in replacement, match the 100 mm bore, 550 mm stroke, PT port thread, and the specific SCD mounting style. This basic configuration uses no mounting accessories, but if you need a pivot mount, the TC centre trunnion (with TCM1 bracket) is available. The cylinder can be ordered with a built-in magnet (-S suffix) for use with CMSG or DMSG sensors, though this model does not include it.
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 SCD100X550 FAQ
The push and pull forces are identical because the piston rod passes through both ends of the cylinder. At 0.5 MPa, the force is 3681 N in both directions. At 0.7 MPa, it is 5153 N, and at the maximum operating pressure of 0.9 MPa, it reaches 6626 N.
Choose the SCD when you need perfectly symmetrical force and speed in both directions, or when you need to mount tooling, a sensor flag, or a mechanical stop on the rear rod. The through-rod design also provides better side-load resistance and anti-rotation guidance than a single-rod cylinder, though it is not a substitute for a fully guided unit under heavy side loads.
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