Airtac SEJ Adjustable Cylinder SEJ40X80-75
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X80-75 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 75mm window, so this Ø40mm unit covers an effective stroke of 5–80mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke80 mm
- Adjust window75 mm
- Effective stroke5–80 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 SEJ40X80-75
The AirTAC SEJ40X80-75 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 75mm adjustable stroke window. A rod exits both ends, yielding identical annulus areas for equal force in both directions—delivering 528 N at 0.5 MPa and 739 N at 0.7 MPa each way. You can dial the retract stroke from 5mm up to the full 80mm.
A mechanical stop screw on the back rod lets you fine-tune the end position directly on the machine without swapping hardware. The extruded aluminum barrel has no external tie rods, and adjustable air cushions at both ends (30mm cushion length) provide smooth deceleration. This SKU ships without a magnet, so it is not ready for CMSE or DMSE position sensing out of the box.
Airtac SEJ Adjustable Cylinder SEJ40X80-75 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X80-75 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 75 mm (5–80 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 75mm 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 SEJ40X80-75
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | Nominal stroke length in mm. |
| -75 | 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 SEJ40X80-75 Is Used
Packaging Conveyor Changeover
Dial the 75mm stop screw to shift the retract stroke between 5 and 80mm when switching carton sizes on a packaging line, using the 739 N both-way force at 0.7 MPa to push diverter arms.
CNC Tailstock Fine-Tuning
Dial in the exact retract distance for a part ejection probe during machine commissioning, locking the back-rod stop screw once the 528 N positioning force hits the exact material stop.
Variable-Stop Clamping
Adjust the mechanical end position on the fly to clamp varying raw material heights without repositioning the cylinder mount, relying on the equal extend and retract forces for consistent clamping.
Is the Airtac SEJ Adjustable Cylinder SEJ40X80-75 the Right Cylinder?
Choose this 40mm bore if you need 528 N of both-way force at 0.5 MPa and a 75mm adjustment window to cover a 5-80mm effective stroke range. If your process requires less force, step down to the 32mm bore for 345 N; if you need more push, step up to the 50mm bore for 825 N. When replacing an ISO 15552 unit, match the 80mm nominal stroke, PT1/4 port, and M12x1.25 rod thread. If your end position is permanently fixed and never changes, a standard SED double-rod cylinder provides the same force without the adjustment hardware. Remember that the adjustable stop screw and air cushions only set the mechanical end and decelerate the load; they do not hold position pneumatically on air loss.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (75mm) 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 75mm 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 SEJ40X80-75 FAQ
The 75mm adjustment window allows you to shorten the retract stroke from the nominal 80mm down to 5mm. You set the exact end position using a stop screw on the back rod, then lock it in place.
Because the rod exits both ends, the force is identical 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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