Airtac SEJ Adjustable Cylinder SEJ50X25-30
The AirTAC Airtac SEJ Adjustable Cylinder SEJ50X25-30 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 Ø50mm unit covers an effective stroke of -5–25mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke25 mm
- Adjust window30 mm
- Effective stroke-5–25 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 SEJ50X25-30
The AirTAC SEJ50X25-30 is a double-acting, double-rod ISO 15552 profile cylinder offering a 30 mm adjustable stroke window. Because the retract stop screw mechanically trims the end position, the effective stroke ranges from 0 mm up to the 25 mm nominal length. This allows you to fine-tune the exact endpoint directly on the machine without swapping hardware.
With a rod exiting both ends, the annular area is identical in both directions, delivering an equal 825 N of force each way at 0.5 MPa. The extruded aluminum barrel contains no external tie rods, and adjustable air cushions at both ends decelerate the load near the stroke ends. This SKU omits the magnet, so it does not support position sensing.
Airtac SEJ Adjustable Cylinder SEJ50X25-30 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50X25-30 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 25 mm |
| Adjustment window | 30 mm (-5–25 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
|---|---|
| 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 30mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø50mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 825 N |
| 0.7 MPa | 1155 N |
| Max (@1.0 MPa) | 168 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 SEJ50X25-30
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×25 | 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 SEJ50X25-30 Is Used
Packaging Changeover
Dial in the 0-25 mm retract end to match varying carton heights on a packaging line, using the 825 N both-way force to push flaps without retooling.
Component Seating
Fine-tune the pressing depth of bearings or pins during machine commissioning, relying on the 30 mm stop screw window to find the exact seating position.
Variable Stop Adjustment
Serve as an adjustable mechanical stop for trial positioning in assembly fixtures, tweaking the endpoint on the fly until the process is locked down.
Is the Airtac SEJ Adjustable Cylinder SEJ50X25-30 the Right Cylinder?
Verify the 30 mm adjustment window covers your required positioning range. If you need less force, the 40 mm bore provides 528 N both ways at 0.5 MPa; if you need more, step up to the 63 mm bore for 1402 N. If the end position never changes after commissioning, a fixed-stroke SED cylinder is sufficient. Note that the air cushion and stop screw only decelerate the load and set the mechanical end; they do not hold position on air loss. For fail-safe holding, use an external rod lock.
This cylinder is dimensionally interchangeable per ISO 15552, so you can match it by bore, stroke, adjustment window, PT1/4 port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). The 25 mm nominal stroke is short, but if your application approaches or exceeds 300 mm, add external guides to manage side loading on the rod.
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 SEJ50X25-30 FAQ
The cylinder has a 30 mm adjustment window via a stop screw on the back rod. This lets you mechanically dial the retract stroke from 0 mm up to the 25 mm nominal stroke. You lock the screw after finding the exact end position.
Because the rod exits both ends, force is equal in both directions. It provides 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and a maximum of 168 kgf at 1.0 MPa.
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