Airtac SEJ Adjustable Cylinder SEJ63X80-40
The AirTAC Airtac SEJ Adjustable Cylinder SEJ63X80-40 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 40–80mm without changing cylinders. Force is equal in both directions.
- BoreØ63 mm
- Nominal stroke80 mm
- Adjust window40 mm
- Effective stroke40–80 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 SEJ63X80-40
The AirTAC SEJ63X80-40 is a double-acting, double-rod ISO 15552 profile cylinder with a 40 mm adjustable stroke window. A rod exits both ends, yielding equal force in both directions at 1402 N (0.5 MPa). By turning the stop screw on the rear rod, you dial the retract end down, giving an effective stroke range of 40-80 mm.
This unit features a PT3/8 port, a 20 mm rod with an M16x1.5 thread, and 36 mm adjustable air cushions at both ends. The extruded aluminum barrel has no external tie rods. Since this SKU lacks the -S magnet option, it does not support CMSE or DMSE position sensors.
Airtac SEJ Adjustable Cylinder SEJ63X80-40 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ63X80-40 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 80 mm |
| Adjustment window | 40 mm (40–80 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 SEJ63X80-40
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 63 | Bore size in mm. |
| ×80 | 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 SEJ63X80-40 Is Used
Tooling Changeover
Dial the 40 mm retract window to match varying part heights during CNC machining changeovers, using the 1402 N both-way force to push and pull fixtures.
Press Stroke Calibration
Fine-tune the exact bottoming position of a light assembly press within the 40-80 mm effective range, locking the rear stop screw once the depth is set.
Variable Stop Diverter
Adjust the retract distance on the fly for a conveyor diverter gate handling different package sizes, relying on the equal double-rod force for smooth retraction.
Is the Airtac SEJ Adjustable Cylinder SEJ63X80-40 the Right Cylinder?
Verify the 40 mm adjustment window covers your positioning range. If you need less force, the 50 mm bore provides 825 N at 0.5 MPa; if you need more, step up to the 80 mm bore for 2268 N. If your end position is fixed and never changes, a standard SED double-rod cylinder is sufficient.
Remember that the adjustable cushion and stop screw decelerate the load near the end of travel but do not hold position on air loss. For fail-safe holding, use an external rod lock. Because the stroke is under 300 mm, side-load stress is minimal, but ensure the M16x1.5 rod threads align cleanly with your fixture to avoid binding.
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 SEJ63X80-40 FAQ
The rear stop screw allows you to shorten the retract stroke by up to 40 mm. For an 80 mm nominal stroke, the effective stroke range is 40-80 mm. You lock the screw after setting the exact end position.
Because the rod exits both ends, force is equal in both directions: 1402 N at 0.5 MPa and 1962 N at 0.7 MPa. The maximum force is 286 kgf at 1.0 MPa.
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