Airtac SEJ Adjustable Cylinder SEJ40X80-40
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X80-40 is a genuine double-acting ISO 15552 double-rod cylinder with a mechanically ADJUSTABLE stroke: a back-rod stop screw lets you fine-tune the retract end over a 40mm window, so this Ø40mm unit covers an effective stroke of 40–80mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke80 mm
- Adjust window40 mm
- Effective stroke40–80 mm
- Port sizePT1/4
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SEJ Adjustable Cylinder SEJ40X80-40
The AirTAC SEJ40X80-40 is a double-acting, double-rod ISO 15552 profile cylinder with a 40 mm adjustment window, letting you dial the retract stroke down from 80 mm to a 40 mm effective minimum. Because a rod exits both ends, the annulus area is identical in both directions, yielding an equal 528 N of force each way at 0.5 MPa. A rear stop screw mechanically sets the end position, which you lock down after fine-tuning the machine stop. This extruded aluminum barrel design omits external tie rods and includes field-adjustable air cushions at both ends to decelerate the load near stroke end. This specific SKU has no magnet, so it will not support CMSE or DMSE position sensors.
With a 16 mm rod and PT1/4 ports, it operates at speeds from 30 to 800 mm/s. The stop screw mechanism is ideal for commissioning and changeover, but it is not a fail-safe lock; it only sets the mechanical end and decelerates near stroke end. For position holding on air loss, an external rod lock is required.
Airtac SEJ Adjustable Cylinder SEJ40X80-40 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X80-40 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 40 mm (40–80 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
|---|---|
| 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 |
Specifications follow the official AirTAC SEJ datasheet and ISO 15552 / VDMA 24562 dimensions. The adjustment screw shortens the retract end only; do not exceed the 40mm window. 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 |
A rod exits both ends, so extend and retract force are identical. Actual usable force is lower than theoretical; size with a safety margin.
Model Code: Airtac SEJ Adjustable Cylinder SEJ40X80-40
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | Nominal stroke length in mm. |
| -40 | Adjustment stroke window in mm (options: 10/20/30/40/50/75/100). |
| -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 (SEJ): Basic, LB, FA, TC, FTC, TCM1, TCM2. Related: SED (double rod, fixed stroke), SE (single rod).
Where the Airtac SEJ Adjustable Cylinder SEJ40X80-40 Is Used
Packaging Stop Calibration
Dial in the 40 mm window to set precise 40-80 mm retract stops for packaging folders, utilizing the equal 528 N both-way force to consistently push and pull flighted lugs.
Part Height Changeover
Swap the retract position on the fly to handle varying carton heights on a conveyor, using the adjustable stroke to match mechanical stops without swapping hardware.
Press Fit Commissioning
Fine-tune the end position during machine commissioning for a light-duty press fit, locking the stop screw once the exact 40-80 mm position is achieved.
Is the Airtac SEJ Adjustable Cylinder SEJ40X80-40 the Right Cylinder?
Verify the 40 mm adjustment window covers your required end-position range, giving an effective stroke of 40 to 80 mm. If you need less force, stepping down to the 32 mm bore yields 345 N both ways at 0.5 MPa; if you need more, the 50 mm bore provides 825 N both ways. If your application never requires stroke adjustments, a fixed-stroke SED cylinder is a simpler alternative. When replacing an ISO 15552 cylinder, match the 40 mm bore, 80 mm stroke, PT1/4 ports, and your mounting choice from the SEJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2—omitting FB, CA, CB, CR). Because the stroke is under 300 mm, side-load stress is moderate, but external guides are still recommended if absorbing heavy lateral loads.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (40mm) covers your range
- ✓ Equal force both directions OK
- ✓ 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 Set the stop screw within the 40mm window; lock it after adjusting.
- 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 SEJ Adjustable Cylinder SEJ40X80-40 FAQ
A stop screw on the back rod lets you mechanically shorten the retract stroke over a 40 mm window. The effective stroke range is 40 mm up to the nominal 80 mm, which you lock in place after setting the exact machine stop.
Because the rod exits both ends, force is equal in both directions. It provides 528 N at 0.5 MPa, 739 N at 0.7 MPa, and a maximum of 108 kgf at 1.0 MPa.
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