Airtac SEJ Adjustable Cylinder SEJ50BX280-75SH
The AirTAC SEJ Adjustable Cylinder SEJ50BX280-75SH 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 75mm window, so this Ø50mm unit covers an effective stroke of 205–280mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke280 mm
- Adjust window75 mm
- Effective stroke205–280 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 SEJ50BX280-75SH
The AirTAC SEJ50BX280-75SH is a double-acting, double-rod ISO 15552 profile cylinder featuring a 75 mm adjustable stroke window, letting you dial the retract end from 205 mm up to 280 mm. A rod exits both ends, yielding identical annulus areas so the drive force is perfectly balanced at 825 N each way at 0.5 MPa. Equipped with a SUS304 stainless steel rod and FKM Viton seals, it handles high-temperature washdowns up to 150 C.
You adjust the stroke via a mechanical stop screw on the back rod, then lock it to set your exact end position. The extruded aluminum barrel omits external tie rods, and field-adjustable air cushions at both ends decelerate the load smoothly near stroke end.
Airtac SEJ Adjustable Cylinder SEJ50BX280-75SH Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50BX280-75SH |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 280 mm |
| Adjustment window | 75 mm (205–280 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 75mm 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 SEJ50BX280-75SH
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×280 | Nominal stroke length in mm. |
| -75 | 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 SEJ50BX280-75SH Is Used
Packaging Conveyor Stop Gate
Dial the 75 mm window to fine-tune the stop gate height for varying carton sizes, using the 825 N both-way force to hold products securely without shifting.
Bottling Line Changeover
Adjust the retract end from 205 to 280 mm during format changeovers to match different bottle heights, leveraging the SUS304 rod for washdown durability.
Is the Airtac SEJ Adjustable Cylinder SEJ50BX280-75SH the Right Cylinder?
Verify the 75 mm window covers your positioning range. If you need less force, the 40 mm bore delivers 528 N both ways at 0.5 MPa; if you need more, step up to the 63 mm bore for 1402 N. If your end position never changes, a fixed-stroke SED saves complexity. Note that the air cushion and stop screw are not locking brakes; for fail-safe position holding on air loss, use an external rod lock or BSED. At 280 mm stroke, external guides are recommended to prevent side-load binding.
As a dimensionally interchangeable ISO 15552 cylinder, you can match this by confirming the 50 mm bore, 280 mm nominal stroke, PT1/4 port, and your mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). The integrated magnet works with CMSE reed and DMSE electronic sensors.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (75mm) 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 75mm 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 SEJ50BX280-75SH FAQ
A stop screw on the rear rod mechanically shortens the retract stroke over a 75 mm window. You can dial the effective stroke anywhere from 205 mm to 280 mm, then lock the screw in place for precise end-position tuning.
Because the double-rod design yields equal annulus areas, force is identical in both directions: 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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