Airtac SEJ Adjustable Cylinder SEJ63X75-40S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ63X75-40S 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 Ø63mm unit covers an effective stroke of 35–75mm without changing cylinders. Force is equal in both directions.
- BoreØ63 mm
- Nominal stroke75 mm
- Adjust window40 mm
- Effective stroke35–75 mm
- Port sizePT3/8
- CushionAdjustable, 36 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 SEJ63X75-40S
The AirTAC SEJ63X75-40S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm adjustable stroke window. A rod exits both ends, and a stop screw on the back rod lets you dial in the retract position, yielding an effective stroke range of 35 to 75mm. Because the piston sees equal annular area on both sides, output force is identical in both directions at 1402 N each way at 0.5 MPa.
This extruded aluminum barrel unit integrates field-adjustable air cushions at both ends to tame end-of-stroke kinetic energy, distinct from a fixed bumper. The included -S magnet supports CMSE reed and DMSE electronic sensors for position feedback, while the rear rod provides an excellent mounting point for external cam flags.
Airtac SEJ Adjustable Cylinder SEJ63X75-40S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ63X75-40S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 40 mm (35–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT3/8 |
| 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, 36 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 (Ø63mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 1402 N |
| 0.7 MPa | 1962 N |
| Max (@1.0 MPa) | 286 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 SEJ63X75-40S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 63 | 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 SEJ63X75-40S Is Used
Press Die Clearance
Dial the 40mm retract window to set precise upper-die clearance on a 63mm press, leveraging the 1402N both-way force for consistent stamping without swapping hardware.
Packaging Changeover
Adjust the effective stroke from 35 to 75mm to accommodate different carton sizes on a packaging line, using the equal push and pull force to grip and release reliably.
Variable Stopper Arm
Tune the stopping position on a conveyor diverter by turning the back-rod stop screw, matching part heights precisely during machine commissioning.
Is the Airtac SEJ Adjustable Cylinder SEJ63X75-40S the Right Cylinder?
This 63mm bore provides 1962 N both ways at 0.7 MPa, sitting between the 50mm bore (825 N) and the 80mm bore (2268 N) at the same pressure. Choose the 40mm window when you need to fine-tune a retract stop over a wide range during machine commissioning; if your end position is fixed, a standard SED double-rod cylinder suffices. The plain SEJ cylinder does not hold position on air loss; for fail-safe holding, pair it with an external rod lock or BSED. Ensure your ISO 15552 replacement matches the PT3/8 port, M16x1.5 rod thread, and 36mm cushion length.
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 SEJ63X75-40S FAQ
A stop screw on the rear rod mechanically shortens the retract stroke. You can dial the retract end up to 40mm, giving an effective stroke range of 35 to 75mm. Lock the screw after setting your exact end position.
Because the double-rod design creates equal annular areas, force is identical both ways: 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and a maximum of 286 kgf at 1.0 MPa.
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