Airtac SEJ Adjustable Cylinder SEJ125X80-10SFTC
The AirTAC Airtac SEJ Adjustable Cylinder SEJ125X80-10SFTC 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 10mm window, so this Ø125mm unit covers an effective stroke of 70–80mm without changing cylinders. Force is equal in both directions.
- BoreØ125 mm
- Nominal stroke80 mm
- Adjust window10 mm
- Effective stroke70–80 mm
- Port sizePT1/2
- CushionAdjustable, 40 mm
About the Airtac SEJ Adjustable Cylinder SEJ125X80-10SFTC
The AirTAC SEJ125X80-10SFTC is a double-acting, double-rod ISO 15552 profile cylinder with a 10mm adjustable stroke window. You can dial the retract end from 70 to 80mm via a back-rod stop screw. Because a rod exits both ends, the annulus area matches, yielding an equal 5734N of force each way at 0.5MPa.
It features a PT1/2 port, a 32mm rod with an M27x2 thread, and an integrated magnet for CMSE or DMSE sensors. The extruded aluminum barrel has no external tie rods, and field-adjustable air cushions at both ends decelerate the 1169kgf max load near stroke end.
Airtac SEJ Adjustable Cylinder SEJ125X80-10SFTC Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ125X80-10SFTC |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 10 mm (70–80 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
|---|---|
| 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 |
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 10mm window. 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 |
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 SEJ125X80-10SFTC
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 125 | Bore size in mm. |
| ×80 | Nominal stroke length in mm. |
| -10 | 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 SEJ125X80-10SFTC Is Used
Press Stroke Tuning
Dial the 10mm retract window to hit exact bottom-dead-center on a 125mm bore press, using the 5734N both-way force to clamp parts precisely.
Variable Stop Forming
Adjust the end position to accommodate different material heights in a forming die without swapping out the entire cylinder hardware.
Changeover Positioning
Fine-tune the 70-80mm stroke range during machine changeovers to match new part profiles, relying on equal push and pull forces.
Is the Airtac SEJ Adjustable Cylinder SEJ125X80-10SFTC the Right Cylinder?
Confirm the 10mm window covers your positioning range before ordering. If you need less force, the adjacent bore 100 delivers 3681N both ways at 0.5MPa; if you need more, note that 125 is the largest SEJ size available. The FTC mounting accessory is included.
For strokes under 300mm side-load is minimal, but always guide external loads. This cylinder does not hold position on air loss; the stop screw only sets the mechanical end. For fail-safe holding, use an external rod lock. If you do not need variable stops, a fixed-stroke SED is sufficient.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (10mm) 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 10mm 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 SEJ125X80-10SFTC FAQ
A stop screw on the back rod lets you mechanically shorten the retract stroke by up to 10mm. The effective stroke range is 70 to 80mm. You lock the screw after setting your exact end position.
Because it is a double-rod cylinder, force is equal in both directions: 5734N at 0.5MPa, 8028N at 0.7MPa, and a maximum of 1169kgf at 1.0MPa.
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