Airtac SEJ Adjustable Cylinder SEJ125X80-30S
The AirTAC SEJ Adjustable Cylinder SEJ125X80-30S 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 30mm window, so this Ø125mm unit covers an effective stroke of 50–80mm without changing cylinders. Force is equal in both directions.
- BoreØ125 mm
- Nominal stroke80 mm
- Adjust window30 mm
- Effective stroke50–80 mm
- Port sizePT1/2
- CushionAdjustable, 40 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 SEJ125X80-30S
The AirTAC SEJ125X80-30S is a double-acting, double-rod ISO 15552 profile cylinder with a 30 mm adjustable stroke window, letting you dial the retract end from 50 mm up to 80 mm. A rod exits both ends, yielding identical annulus areas and equal force of 5734 N each way at 0.5 MPa. The built-in magnet supports CMSE reed and DMSE electronic sensors for position feedback.
A stop screw on the back rod mechanically sets the end position, which you lock after tuning to hit an exact machine stop. The extruded aluminum barrel omits external tie rods, and field-adjustable air cushions at both ends decelerate the 32 mm rod near stroke ends without acting as a brake.
Airtac SEJ Adjustable Cylinder SEJ125X80-30S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ125X80-30S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 30 mm (50–80 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 30mm 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 SEJ125X80-30S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 125 | Bore size in mm. |
| ×80 | Nominal stroke length in mm. |
| -30 | 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 SEJ125X80-30S Is Used
Press Stroke Tuning
Dial the 30 mm window to fine-tune the press end position, applying 8028 N at 0.7 MPa to seat bearings without over-traveling.
Multi-Height Changeover
Adjust the retract from 50 to 80 mm to switch a conveyor lift between part heights, using the equal both-way force for stable lifting.
Machine Commissioning
Set the exact retract stop during setup, lock the back rod, and use DMSE sensors to verify the final position under dynamic loads.
Is the Airtac SEJ Adjustable Cylinder SEJ125X80-30S the Right Cylinder?
Confirm the 30 mm adjustment window covers your range. If you need less force, the 100 mm bore provides 3681 N at 0.5 MPa; if you need more, there is no larger standard SEJ bore. If exact end-position tuning is unnecessary, a fixed-stroke SED saves length. For fail-safe position holding on air loss, use a BSED or external rod lock, as the cushion and stop screw only set the mechanical end. To replace an ISO 15552 cylinder, match the 125 mm bore, 80 mm stroke, 30 mm window, PT1/2 port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (30mm) 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 30mm 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 SEJ125X80-30S FAQ
It has a 30 mm adjustment window, meaning the effective retract stroke can be dialed from 50 mm up to the nominal 80 mm. You set the stop screw on the back rod and lock it after tuning.
Because the rod exits both ends, force is equal in both directions: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and a maximum of 1169 kgf at 1.0 MPa.
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