Airtac SEJ Adjustable Cylinder SEJ40X75-50
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X75-50 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 Ø40mm unit covers an effective stroke of 25–75mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke75 mm
- Adjust window50 mm
- Effective stroke25–75 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 SEJ40X75-50
The AirTAC SEJ40X75-50 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 50 mm adjustable stroke window, yielding an effective travel range of 25 to 75 mm. A rod exits both ends, ensuring the annulus area remains identical in both directions. This delivers an equal thrust of 528 N each way at 0.5 MPa, preventing directional force imbalance.
You mechanically dial in the exact retract end-position using a stop screw on the back rod, then lock it in place. This allows on-machine commissioning without swapping hardware. The extruded aluminum barrel omits external tie rods, and this specific SKU lacks a magnet, so it cannot host CMSE or DMSE position sensors.
Airtac SEJ Adjustable Cylinder SEJ40X75-50 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X75-50 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 50 mm (25–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
|---|---|
| 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 50mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø40mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 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 SEJ40X75-50
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | 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 SEJ40X75-50 Is Used
Pneumatic Press Stroke Tuning
Dial in the exact 25-75 mm crush depth on a small pneumatic crimping press, leveraging the 528 N both-way force to crimp connectors consistently without re-mounting hardware.
Variable-Height Conveyor Diverter
Adjust the retract stop on the fly to match different package heights on a packaging line, using the equal push/pull force to reliably pivot the diverter arm.
Component Trial Positioning
Find the optimal 25-75 mm engagement distance for a delicate testing probe during machine commissioning, locking the back-rod stop screw once the ideal position is found.
Is the Airtac SEJ Adjustable Cylinder SEJ40X75-50 the Right Cylinder?
Verify that the 50 mm adjustment window covers your required travel range, allowing you to dial the retract stop precisely from 25 to 75 mm. If your application needs less than 528 N (0.5 MPa) of both-way force, stepping down to the 32 mm bore yields 345 N; if you need more thrust, the 63 mm bore provides 1402 N. If the end position never varies after commissioning, a fixed-stroke SED cylinder is sufficient. Remember that a plain SEJ does not hold position on air loss—the adjustable cushion only decelerates near stroke end, not a mechanical lock. For fail-safe holding, specify an external rod lock. This unit is dimensionally interchangeable per ISO 15552 (bore 40, 75 mm stroke, PT1/4 port, no magnet).
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 SEJ40X75-50 FAQ
A stop screw on the rear rod mechanically limits the retract stroke over a 50 mm window. You can fine-tune the effective stroke anywhere from 25 mm up to the full 75 mm, then lock the screw in place for consistent operation.
Because it is a double-rod cylinder, the force is equal in both extend and retract directions. It provides 528 N at 0.5 MPa, 739 N at 0.7 MPa, and a maximum of 108 kgf at 1.0 MPa.
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