Airtac SEJ Adjustable Cylinder SEJ80X75-50
The AirTAC Airtac SEJ Adjustable Cylinder SEJ80X75-50 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 50mm window, so this Ø80mm unit covers an effective stroke of 25–75mm without changing cylinders. Force is equal in both directions.
- BoreØ80 mm
- Nominal stroke75 mm
- Adjust window50 mm
- Effective stroke25–75 mm
- Port sizePT3/8
- CushionAdjustable, 36 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 SEJ80X75-50
The AirTAC SEJ80X75-50 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 50 mm adjustable stroke window. A rod exits both ends, yielding identical annulus areas so output force is equal in both directions at 2268 N each way at 0.5 MPa. By turning the mechanical stop screw on the back rod, you dial the retract end down, setting an effective stroke range of 25-75 mm without swapping hardware.
This 80 mm bore pneumatic cylinder uses a PT3/8 port and a Ø25 mm rod with an M20x1.5 thread. The extruded aluminum barrel contains no external tie rods, and field-adjustable air cushions at both ends decelerate the load near stroke end. This SKU omits the magnet, so it does not support CMSE or DMSE position sensors.
Airtac SEJ Adjustable Cylinder SEJ80X75-50 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ80X75-50 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 50 mm (25–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
|---|---|
| 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, 36 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 50mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø80mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 2268 N |
| 0.7 MPa | 3175 N |
| Max (@1.0 MPa) | 463 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 SEJ80X75-50
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 80 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -50 | 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 SEJ80X75-50 Is Used
Press Stroke Calibration
Dial in the exact 25-75 mm contact depth on an assembly press. The 3175 N both-way force at 0.7 MPa handles firm seating while the stop screw locks the final position.
Part Height Changeover
Switch a packaging line between different carton heights. Adjust the retract end up to 50 mm on the fly to match new fold positions without changing cylinder hardware.
Variable Stop Positioning
Use the rear rod as a mechanical flag to trigger an external sequence. The double-rod design ensures the 2268 N retract force matches the extend force for consistent clamping.
Is the Airtac SEJ Adjustable Cylinder SEJ80X75-50 the Right Cylinder?
Verify the 50 mm adjustment window covers your positioning range, giving a usable 25-75 mm stroke. If you need less force, the adjacent 63 mm bore provides 1402 N at 0.5 MPa; stepping up to the 100 mm bore yields 3681 N at 0.5 MPa. If the end position never varies, a fixed-stroke SED avoids the stop screw and saves space. For matching an ISO 15552 replacement, confirm the 75 mm nominal stroke, PT3/8 port, and mounting choice from Basic, FA, LB, TC, FTC, TCM1, or TCM2.
The adjustable stop screw sets the mechanical end position and the air cushions decelerate the load, but neither holds position upon air loss. For fail-safe load holding, specify a BSED or an external rod lock. Because the nominal stroke is under 300 mm, external side-load guides are less critical than on long-stroke units, but always ensure the load is axially aligned.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (50mm) 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 50mm 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 SEJ80X75-50 FAQ
A mechanical stop screw on the rear rod lets you shorten the retract stroke by up to 50 mm. The effective stroke range is 25-75 mm. You dial the end position during commissioning and lock the screw in place.
Because it is a double-rod cylinder, force is equal in both directions. It generates 2268 N at 0.5 MPa, 3175 N at 0.7 MPa, and a maximum of 463 kgf at 1.0 MPa.
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