Airtac SEJ Adjustable Cylinder SEJ40X75-40S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X75-40S 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 40mm window, so this Ø40mm unit covers an effective stroke of 35–75mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke75 mm
- Adjust window40 mm
- Effective stroke35–75 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 SEJ40X75-40S
The AirTAC SEJ40X75-40S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40 mm adjustable stroke window. A stop screw on the rear rod lets you dial the retract end position, providing an effective stroke range of 35 to 75 mm. Because the rod exits both ends, the annulus area is symmetrical, delivering an equal 528 N of force in both directions at 0.5 MPa.
This extruded aluminum profile cylinder includes a built-in magnet for position sensing. You can mount CMSE reed or DMSE electronic sensors directly into the barrel slot. Adjustable air cushions at both ends decelerate the load near the stroke ends, while the M12x1.25 rod thread handles the mechanical attachment.
Airtac SEJ Adjustable Cylinder SEJ40X75-40S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X75-40S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 40 mm (35–75 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 40mm 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 SEJ40X75-40S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -40 | 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 SEJ40X75-40S Is Used
Dispenser Nozzle Calibration
Dial in the exact 35-75 mm retract height for a fluid dispensing nozzle. The equal 528 N both-way force ensures consistent pressure during fluid discharge without drift.
Packaging Changeover
Adjust the mechanical stop on the back rod when switching between different carton heights on a packaging line, avoiding the need to swap out entire cylinders for new part formats.
Trial Positioning Jigs
Use the 40 mm window to fine-tune the end position of a clamping jig during prototype machining, locking the stop screw once the optimal 50 mm reach is found.
Is the Airtac SEJ Adjustable Cylinder SEJ40X75-40S the Right Cylinder?
Verify that the 40 mm adjustment window covers your required end-position variance, giving a usable 35-75 mm range. If you need less fine-tuning, a smaller adjustment window or a fixed-stroke SED cylinder might suffice. For sizing, the neighboring 32 mm bore provides 345 N both ways at 0.5 MPa, while stepping up to the 50 mm bore yields 825 N. If your application requires fail-safe position holding on air loss, note that this cylinder does not lock; you will need an external rod lock or a BSED variant.
At a 75 mm nominal stroke, side loads are minimal, but always ensure the load is guided externally to prevent binding on the 16 mm rod. The PT1/4 port and standard mounting options (Basic, FA, LB, TC, FTC, TCM1, TCM2) ensure drop-in ISO 15552 dimensional interchangeability for machine upgrades.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (40mm) 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 40mm 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 SEJ40X75-40S FAQ
A stop screw on the rear rod mechanically shortens the retract stroke over a 40 mm window. This allows the effective stroke to be dialed anywhere from 35 mm up to the full 75 mm, which is ideal for fine-tuning a machine end position during commissioning.
Because it is a double-rod cylinder, the force is identical in both 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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