Airtac SEJ Adjustable Cylinder SEJ50BX30-10SFA
The AirTAC SEJ Adjustable Cylinder SEJ50BX30-10SFA 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 20–30mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke30 mm
- Adjust window10 mm
- Effective stroke20–30 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 SEJ50BX30-10SFA
The AirTAC SEJ50BX30-10SFA is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod for corrosion and washdown environments. A rod exits both ends, ensuring the annulus area remains identical for equal force and speed in both directions. The drive delivers 825 N each way at 0.5 MPa.
This variant features a 10 mm adjustable stroke window, meaning the retract end position can be mechanically fine-tuned via a stop screw on the back rod to achieve an effective stroke range of 20 to 30 mm. It includes a magnet for position sensing and uses an FA front mounting bracket. The extruded aluminum barrel contains no external tie rods, and adjustable air cushions at both ends decelerate the load near the stroke endpoints.
Airtac SEJ Adjustable Cylinder SEJ50BX30-10SFA Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50BX30-10SFA |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 30 mm |
| Adjustment window | 10 mm (20–30 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 SEJ50BX30-10SFA
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SEJ50BX30-10SFA Is Used
Washdown Diverter Fine-Tuning
Dial in the exact 20-30 mm flap position on a food-grade conveyor diverter using the 10 mm back-rod stop screw, leveraging the 825 N equal both-way force and SUS304 rod for rinse-down duty.
Lab Dispenser Positioning
Set precise trial end positions for a liquid dispensing head, using the integrated magnet with DMSE electronic sensors to verify the exact 20-30 mm stroke window in corrosive chemical environments.
Is the Airtac SEJ Adjustable Cylinder SEJ50BX30-10SFA the Right Cylinder?
Confirm the 10 mm adjustment window covers your required end-position range, yielding an effective 20 to 30 mm stroke. If you need less force, the adjacent bore down is 40 mm, providing 528 N both ways at 0.5 MPa. If your application requires more thrust, stepping up to the 63 mm bore yields 1402 N both ways at 0.5 MPa. If your end position never changes after commissioning, a fixed-stroke SED cylinder is sufficient.
This cylinder uses PT1/4 ports and an M16x1.5 rod thread. The adjustable air cushion is strictly for deceleration and is not a lock; a plain SEJ does not hold position on air loss, so specify an external rod lock for fail-safe holding. Dimensionally interchangeable per ISO 15552, it accepts Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts (omitting FB/CA/CB/CR).
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 SEJ50BX30-10SFA FAQ
A stop screw on the rear rod mechanically shortens the retract stroke over a 10 mm window. For this SEJ50BX30-10SFA model, you can dial the effective stroke down from 30 mm to 20 mm. You lock the screw after setting your exact end position on the machine.
Because it is a double-rod cylinder, the force is identical 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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