Airtac SEJ Adjustable Cylinder SEJ125X80-30
The AirTAC SEJ Adjustable Cylinder SEJ125X80-30 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 SEJ125X80-30
The AirTAC SEJ125X80-30 is a double-acting, double-rod ISO 15552 profile cylinder with a mechanically adjustable retract stroke. A rear stop screw lets you dial the retract end position up to 30 mm, yielding an effective stroke range of 50 to 80 mm without changing hardware.
This 125 mm bore unit runs on PT1/2 ports and a Ø32 mm rod with an M27x2 end thread. It features field-adjustable air cushions at both ends to manage kinetic energy, and its extruded aluminum barrel provides ISO 15552 dimensional interchangeability without external tie rods. This SKU omits the magnet, so it does not support CMSE or DMSE position sensing.
Airtac SEJ Adjustable Cylinder SEJ125X80-30 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ125X80-30 |
|---|---|
| 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 SEJ125X80-30
| 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 SEJ125X80-30 Is Used
Heavy Press Tonnage Tuning
Dial the 30 mm stop screw to precisely set the bottom dead center on a 5734 N stamping press, ensuring perfect part forming without re-mounting the cylinder.
Multi-Height Pallet Changeover
Adjust the retract end from 50 to 80 mm to accommodate varying pallet thicknesses on a heavy-duty conveyor, using the equal both-way force to pull loads back reliably.
Injection Mold Seating
Fine-tune the exact mold closure position during machine commissioning, locking the rear rod stop screw once the 8028 N clamping force meets the exact mold half.
Is the Airtac SEJ Adjustable Cylinder SEJ125X80-30 the Right Cylinder?
Verify the 30 mm adjustment window covers your positioning range; if you need less than 50 mm, step down to the 100 mm bore. The 100 mm bore provides 3681 N both ways at 0.5 MPa, while stepping up is not possible as 125 mm is the largest SEJ size. If your end position never changes, a fixed-stroke SED avoids the stop screw and saves space.
For any application at or above 300 mm stroke, external guides are mandatory to prevent side-loading damage, though this 80 mm unit is short enough to manage moderate inline loads. The adjustable cushion only decelerates the load near the stroke end; a plain SEJ does not hold position on air loss, so specify a BSED or external rod lock for fail-safe holding.
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 SEJ125X80-30 FAQ
The retract stroke can be dialed up to 30 mm via a mechanical stop screw on the back rod. This gives an effective stroke range of 50 to 80 mm. You set the exact end position on the machine and lock the screw in place.
Because it is a double-rod cylinder, 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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Standard models are processed and dispatched in 3-5 business days.
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