Airtac SED Double Rod Cylinder SED40X850S
The AirTAC Airtac SED Double Rod Cylinder SED40X850S 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 SED40X850S
The AirTAC SED40X850S is a double-acting, double-rod profile cylinder conforming to the ISO 15552 interface. Because a rod exits both end covers, the annulus area is identical on extension and retraction, yielding an equal 528 N of thrust in both directions at 0.5 MPa. The extruded aluminum barrel contains no external tie rods, ensuring a clean profile for tight machinery layouts.
Equipped with a standard magnet (-S), this unit supports CMSE reed and DMSE electronic sensors for dual-end position tracking. The rear rod protrusion is highly valuable for mounting secondary cams or driving a secondary mechanism, while simultaneously improving load guidance and resisting rotation. Remember to leave adequate rear clearance for the extended 850 mm stroke.
Airtac SED Double Rod Cylinder SED40X850S Technical Specifications
| Model | Airtac SED Double Rod Cylinder SED40X850S |
|---|---|
| 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 SED40X850S
| 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 SED40X850S Is Used
Transfer Line Pusher
Provides a balanced 528 N both ways at 0.5 MPa to push parts down a conveyor, using the rear rod to trip a limit flag for timing.
Web Edge Guide
Utilizes the twin-rod anti-rotation properties to steer material webs accurately without lateral deflection over the long 850 mm stroke.
Dual-Action Shuttle
Drives a secondary mechanism from the rear rod end while moving the primary load, capitalizing on equal extend and retract forces.
Is the Airtac SED Double Rod Cylinder SED40X850S the Right Cylinder?
When sizing this 40 mm bore, note the neighboring options: stepping down to a 32 mm bore yields 345 N both ways at 0.5 MPa, while stepping up to a 50 mm bore provides 825 N. Choose this double-rod SED over a single-rod SE when your application demands anti-rotation stability, symmetrical force, or a rear-rod connection point. For a drop-in ISO 15552 replacement, match the 40 mm bore, 850 mm stroke, PT1/4 port, and mounting style.
At 850 mm, the stroke length requires careful attention to side loads. Always use external guide rails to prevent rod binding and premature seal wear. Note that a standard SED does not hold position on air loss; the piston will drift. For fail-safe holding, consider a BSED double-rod rod lock or an external pilot-operated check valve. The field-adjustable air cushion at both ends decelerates the load near stroke end but does not act as a brake.
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 SED40X850S FAQ
The double-rod design provides equal force in both directions: 528 N at 0.5 MPa, 739 N at 0.7 MPa, and a maximum of 108 kgf at 1.0 MPa.
The twin rods offer superior resistance to torsional side loads and allow the rear rod end to drive a secondary mechanism or mount a sensor cam, while maintaining identical ISO 15552 mounting dimensions.
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