Airtac SEJ Adjustable Cylinder SEJ63X75-20S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ63X75-20S 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 20mm window, so this Ø63mm unit covers an effective stroke of 55–75mm without changing cylinders. Force is equal in both directions.
- BoreØ63 mm
- Nominal stroke75 mm
- Adjust window20 mm
- Effective stroke55–75 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 SEJ63X75-20S
The AirTAC SEJ63X75-20S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 20mm adjustable stroke window. A rod exits both ends, meaning the effective retract stroke can be dialed from 55mm up to 75mm via a stop screw on the back rod. This allows you to fine-tune the end position directly on the machine without changing mounting hardware.
Because the piston has a rod on both sides, the annulus area is identical in both directions, yielding an equal force of 1402 N each way at 0.5 MPa. The extruded aluminum barrel contains no external tie rods, and the included -S magnet enables position detection using CMSE reed or DMSE electronic sensors.
Airtac SEJ Adjustable Cylinder SEJ63X75-20S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ63X75-20S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 20 mm (55–75 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 20mm 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 SEJ63X75-20S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 63 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -20 | 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 SEJ63X75-20S Is Used
Forming Press Depth
Dial the 20mm retract window to set precise 55-75mm forming depths on aluminum housings, utilizing the 1962 N at 0.7 MPa to press consistently from both sides.
Packaging Changeover
Adjust the retract end-stop on the fly when switching between varying box sizes on a packaging line, using the equal both-way force to push flaps squarely.
Sensor Flag Alignment
Use the extended back rod to carry a cam for DMSE electronic sensors, making minute 1-2mm adjustments to the trigger position during machine commissioning.
Is the Airtac SEJ Adjustable Cylinder SEJ63X75-20S the Right Cylinder?
Verify that the 20mm adjustment window covers your required end-position range. If you need less force, the adjacent 50mm bore provides 825 N at 0.5 MPa; if you need more, the 80mm bore provides 2268 N at 0.5 MPa. If your end position never changes, a fixed-stroke SED cylinder is sufficient.
Note that the adjustable air cushion and mechanical stop screw only decelerate the load and set the end position; they do not hold position upon air loss. For fail-safe holding, use an external rod lock. This PT3/8 ported cylinder is dimensionally interchangeable per ISO 15552.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (20mm) 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 20mm 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 SEJ63X75-20S FAQ
A stop screw on the rear rod mechanically shortens the retract stroke over a 20mm window. The effective stroke can be dialed from 55mm up to the nominal 75mm, which you lock in place after setting your exact end position.
Because it is a double-rod cylinder, the force is identical in both directions. It outputs 1402 N at 0.5 MPa, 1962 N at 0.7 MPa, and reaches a maximum of 286 kgf at 1.0 MPa.
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