Airtac SED Double Rod Cylinder SED125X120
The AirTAC Airtac SED Double Rod Cylinder SED125X120 is a genuine double-acting ISO 15552 double-rod cylinder: a Ø32mm piston rod exits BOTH ends of the Ø125mm bore, giving equal force and speed in both directions and letting you mount tooling or a sensor flag on the back rod. Stroke 120mm, PT1/2 ports, adjustable cushioning.
- BoreØ125 mm
- Stroke120 mm
- Port sizePT1/2
- ConfigurationDouble rod
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SED Double Rod Cylinder SED125X120
The AirTAC SED125X120 is a double-acting, double-rod profile cylinder built to the ISO 15552 interface. Because a rod exits both end covers, the annulus area is identical on extend and retract. It delivers exactly 5734 N of force each way at 0.5 MPa. The extruded aluminum barrel has no external tie rods.
This 125mm bore unit uses a PT1/2 port and a Ø32mm rod with an M27x2 thread. Since this SKU lacks the -S magnet, it has no internal position sensing. The rear rod protrudes from the back cover, providing a solid shaft for mounting a cam, external flag, or driving a secondary mechanism. Field-adjustable air cushioning at both ends decelerates the 30-500 mm/s motion near stroke end.
Airtac SED Double Rod Cylinder SED125X120 Technical Specifications
| Model | Airtac SED Double Rod Cylinder SED125X120 |
|---|---|
| Series | SED ISO 15552 double-rod cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 mm |
| Configuration | Double rod, double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C (0–150 °C with FKM seals) |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SED datasheet and ISO 15552 / VDMA 24562 dimensions. Confirm against the product label before installation. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø125mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 5734 N |
| 0.7 MPa | 8027 N |
| Max (@1.0 MPa) | 1169 kgf |
Because a rod exits both ends, the effective piston area — and therefore the force — is identical on extend and retract. Actual usable force is lower than theoretical; size with a safety margin.
Model Code: Airtac SED Double Rod Cylinder SED125X120
| SED | ISO 15552 profile-barrel DOUBLE-ROD double-acting cylinder. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensor sensing. |
Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B). Seals: TPU (blank) / FKM high-temp (H) / NBR (N). Thread: PT (blank) / G. Mounting (SED): Basic, LB, FA, TC, FTC, TCM1, TCM2. Related: SE (single rod), SEJ (double-rod adjustable stroke), BSED (double-rod rod lock).
Where the Airtac SED Double Rod Cylinder SED125X120 Is Used
Heavy Press Ejection
Drives a dual-sided ejection plate in a metal stamping press, utilizing the 5734 N both-way force to strip thick parts reliably without rotational binding.
Large Mold Clamping
Provides equal clamping and release pressure on a bulky resin mold, using the rear rod to actuate a mechanical safety interlock cam.
Pallet Diverting
Pushes heavy industrial pallets transversely on a high-mass conveyor line, relying on the twin rods to absorb severe side loads during impact.
Is the Airtac SED Double Rod Cylinder SED125X120 the Right Cylinder?
Choose this 125mm bore if you need heavy equal bidirectional thrust. Stepping down to the 80mm bore yields 2268 N both ways at 0.5 MPa. As the largest standard SE profile size, there is no larger bore to step up to. The twin rods prevent rotation and support heavy loads better than a single-rod SE. Remember that a plain SED does not hold position on air loss; the piston drifts. For fail-safe holding, use a BSED double-rod lock or an external pilot-operated check valve. When replacing an ISO 15552 cylinder, match the 120mm stroke, PT1/2 port, and mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Quick checklist
- ✓ Equal force/speed both directions needed?
- ✓ Back-rod space for tooling or a flag
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/G)
- ✓ Magnet (-S) for CMSE/DMSE sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Support both rod ends; avoid side load.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (LB/FA/TC/FTC/TCM1/TCM2).
- check Installation by qualified personnel per AirTAC docs.
Airtac SED Double Rod Cylinder SED125X120 FAQ
Because the double rods occupy both sides of the piston, force is identical in both directions. It provides 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and a maximum of 1169 kgf at 1.0 MPa.
The twin rods provide superior anti-rotation guidance and equal thrust both ways. The protruding rear rod can also drive a secondary mechanism or sensor flag, though this specific SKU lacks the internal -S magnet for reed or electronic sensors.
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