Airtac SEJ Adjustable Cylinder SEJ50X75-30
The AirTAC Airtac SEJ Adjustable Cylinder SEJ50X75-30 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 45–75mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke75 mm
- Adjust window30 mm
- Effective stroke45–75 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 SEJ50X75-30
The AirTAC SEJ50X75-30 is a double-acting, double-rod ISO 15552 profile cylinder with a 30 mm adjustable stroke window, yielding an effective travel range of 45 to 75 mm. A rod exits both ends, meaning the annulus area is identical in both directions. This gives you exactly 825 N of output force at 0.5 MPa for both extend and retract motions.
You dial in the retract end position using a mechanical stop screw on the back rod, then lock it down. This avoids swapping hardware when fine-tuning a machine stop. The extruded aluminum barrel has no external tie rods, and the field-adjustable air cushion at both ends decelerates the load smoothly near stroke end. This SKU ships without a magnet, so it does not support position sensing.
Airtac SEJ Adjustable Cylinder SEJ50X75-30 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50X75-30 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 30 mm (45–75 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 SEJ50X75-30
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SEJ50X75-30 Is Used
Packaging Changeover
Dial the retract stroke between 45 and 75 mm to accommodate varying carton depths on a packaging line without machining new stop blocks, utilizing the 825 N both-way force.
Press Fit Tuning
Fine-tune the insertion depth of a bearing press during commissioning by adjusting the back-rod stop screw, ensuring precise seating without over-traveling.
Diverter Gate Positioning
Set an exact reject gate angle on a conveyor by mechanically limiting the retract stroke, allowing quick adaptation to different product widths on the fly.
Is the Airtac SEJ Adjustable Cylinder SEJ50X75-30 the Right Cylinder?
Verify the 30 mm adjustment window covers your required end-position range. If you need less force, the adjacent bore down is 40 mm providing 528 N at 0.5 MPa; if you need more power, step up to the 63 mm bore for 1402 N at 0.5 MPa. If your end stop never changes, a fixed-stroke SED cylinder is enough. Remember that the adjustable cushion and stop screw only set the mechanical end and decelerate the load; they do not hold position on air loss. For fail-safe holding, use an external rod lock. As a dimensionally interchangeable ISO 15552 unit, match the PT1/4 port, 75 mm nominal stroke, 30 mm window, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2) for a direct replacement.
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 SEJ50X75-30 FAQ
The 30 mm adjustment window allows you to mechanically shorten the retract stroke from the 75 mm nominal down to 45 mm. You set the exact end position using the stop screw on the back rod and lock it in place.
Because the rod exits both ends, force is equal 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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