Airtac SED Double Rod Cylinder SED40X850
The AirTAC Airtac SED Double Rod Cylinder SED40X850 is a genuine double-acting ISO 15552 double-rod cylinder: a Ø16mm piston rod exits BOTH ends of the Ø40mm bore, giving equal force and speed in both directions and letting you mount tooling or a sensor flag on the back rod. Stroke 850mm, PT1/4 ports, adjustable cushioning.
- BoreØ40 mm
- Stroke850 mm
- Port sizePT1/4
- ConfigurationDouble rod
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SED Double Rod Cylinder SED40X850
The AirTAC SED40X850 is a double-acting, double-rod profile cylinder built to ISO 15552 dimensional standards. Because a 16mm rod exits both end covers, the annulus area is identical on extend and retract. It yields an equal 528 N of force in both directions at 0.5 MPa. The extruded aluminum barrel has no external tie rods, ensuring a clean profile that drops in for any ISO 15552 double-rod replacement.
This 850mm stroke configuration features a PT1/4 port and adjustable air cushioning at both ends to absorb kinetic energy near stroke extremes. Note that this SKU lacks the -S magnet option, so it cannot host CMSE or DMSE position sensors without modification. The rear rod extension is excellent for mounting a cam or driving a secondary mechanism.
Airtac SED Double Rod Cylinder SED40X850 Technical Specifications
| Model | Airtac SED Double Rod Cylinder SED40X850 |
|---|---|
| Series | SED ISO 15552 double-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 850 mm |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 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 SED40X850
| SED | ISO 15552 profile-barrel DOUBLE-ROD double-acting cylinder. |
|---|---|
| 40 | Bore size in mm. |
| ×850 | 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 SED40X850 Is Used
Pallet Transfer Diverters
Drives a dual-sided pusher arm across an 850mm conveyor belt. The equal 528 N both-way force ensures smooth, consistent diverting of light pallets without speed variation between extend and retract strokes.
Web Guide Mechanisms
Uses the twin-rod anti-rotation property to straighten moving film or foil webs. The rear rod protrudes to mount a mechanical cam flag, triggering external pneumatic logic without needing onboard sensors.
PCB Panel Handling
Transfers delicate printed circuit boards between testing stations. The 30mm adjustable cushion at both ends decelerates the 850mm travel smoothly, preventing impact damage to electronic components.
Is the Airtac SED Double Rod Cylinder SED40X850 the Right Cylinder?
Selecting this 40mm bore provides 528 N both-way force at 0.5 MPa. If your application requires less power, the neighboring 32mm bore outputs 345 N both ways. For heavier loads, stepping up to the 50mm bore provides 825 N both ways at 0.5 MPa. Choose this double-rod SED over a single-rod SE when you need superior anti-rotation guidance or a rear rod for external tooling.
At 850mm of stroke, the 16mm rod is highly susceptible to side loads. You must use external linear guides to prevent binding and premature seal wear. Remember that a plain SED does not hold position on air loss; the piston drifts. For fail-safe holding, use an external rod lock or a BSED double-rod rod lock cylinder. Ensure your mounting choice falls within the SED subset: Basic, FA, LB, TC, FTC, TCM1, or 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 SED40X850 FAQ
The SED40X850 provides equal force in both directions due to the double-rod design. It outputs 528 N at 0.5 MPa, 739 N at 0.7 MPa, and a maximum of 108 kgf at 1.0 MPa.
A double-rod cylinder provides identical force and speed in both directions, and offers better load guidance against rotation. The rear rod can also drive a secondary mechanism or sensor flag, which is impossible on a single-rod cylinder.
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