Airtac SEJ Adjustable Cylinder SEJ50BX250-10S
The AirTAC SEJ Adjustable Cylinder SEJ50BX250-10S 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 10mm window, so this Ø50mm unit covers an effective stroke of 240–250mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke250 mm
- Adjust window10 mm
- Effective stroke240–250 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 SEJ50BX250-10S
The AirTAC SEJ50BX250-10S is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod for corrosion resistance. A rod exits both ends, ensuring the annulus area remains identical for equal force and speed in both directions. It delivers 825 N each way at 0.5 MPa and 1154 N at 0.7 MPa.
This unit features a 10 mm adjustable stroke window, allowing the retract end position to be fine-tuned mechanically via a back-rod stop screw, yielding an effective stroke range of 240-250 mm. The extruded aluminum barrel has no external tie rods, and the field-adjustable air cushions at both ends decelerate the load near the stroke ends without acting as a locking brake.
Airtac SEJ Adjustable Cylinder SEJ50BX250-10S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50BX250-10S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Adjustment window | 10 mm (240–250 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 10mm 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 SEJ50BX250-10S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | Nominal stroke length in mm. |
| -10 | 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 SEJ50BX250-10S Is Used
Dispenser Head Calibration
Dial in the 10 mm retract window to precisely set a 240-250 mm dispensing nozzle height, using the 825 N both-way force to lift the head without drift.
Washdown Part Ejector
Leverage the SUS304 stainless rod in food packaging lines to push parts at 1154 N, adjusting the stop screw to match varying conveyor lane widths.
Press Sub-assembly Tuning
Fine-tune the mechanical end stop during machine commissioning to find the exact 245 mm pressing position before locking the back-rod screw.
Is the Airtac SEJ Adjustable Cylinder SEJ50BX250-10S the Right Cylinder?
Confirm this 10 mm adjustment window covers your required end-position range. If you need less force, the adjacent 40 mm bore provides 528 N at 0.5 MPa; if you need more, step up to the 63 mm bore for 1402 N. If exact positioning is not required and a fixed retract stop is sufficient, a standard SED double-rod cylinder may be enough. For ISO 15552 replacement matching, verify the 50 mm bore, 250 mm stroke, PT1/4 port, and M16x1.5 rod thread. Since the stroke is 250 mm, ensure external guides are used to manage side loads and prevent rod binding. A plain SEJ does not hold position on air loss; for fail-safe holding, use a BSED or an external rod lock.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (10mm) 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 10mm 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 SEJ50BX250-10S FAQ
A stop screw on the back rod mechanically shortens the retract stroke over a 10 mm window, giving an effective stroke range of 240-250 mm. You set the exact end position during commissioning and lock it in place.
Because it is a double-rod cylinder, the 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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