Airtac SEJ Adjustable Cylinder SEJ80X75-40S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ80X75-40S 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 Ø80mm unit covers an effective stroke of 35–75mm without changing cylinders. Force is equal in both directions.
- BoreØ80 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 SEJ80X75-40S
The AirTAC SEJ80X75-40S is a double-acting, double-rod ISO 15552 profile cylinder with a 40mm adjustable stroke window. A rod exits both ends, meaning the annular area is identical in both directions. You get exactly 2268N of force each way at 0.5MPa, preventing speed mismatches in dual-motion tasks.
A mechanical stop screw on the back rod lets you dial the retract end down by 40mm, yielding an effective stroke range of 35 to 75mm. This built-in adjustability is ideal for fine-tuning end positions directly on the machine without swapping hardware. The extruded aluminum barrel uses no external tie rods, and the -S magnet enables position detection via CMSE reed or DMSE electronic sensors.
Airtac SEJ Adjustable Cylinder SEJ80X75-40S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ80X75-40S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 40 mm (35–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
|---|---|
| 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 (Ø80mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 2268 N |
| 0.7 MPa | 3175 N |
| Max (@1.0 MPa) | 463 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 SEJ80X75-40S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 80 | 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 SEJ80X75-40S Is Used
Press Stroke Tuning
Dial in the exact 35-75mm clamping depth on a press fixture, using the 3175N both-way force at 0.7MPa to secure varying material thicknesses without retooling.
Packaging Changeover
Adjust the retract distance on the fly when switching box sizes, leveraging the equal push/pull force to consistently push cartons into a sealing station.
Conveyor Stop Calibration
Fine-tune the mechanical stop position for product indexing, using the 40mm window to perfectly align parts regardless of minor conveyor drift.
Is the Airtac SEJ Adjustable Cylinder SEJ80X75-40S the Right Cylinder?
Verify the 40mm adjustment window covers your required positioning range, giving a 35 to 75mm effective stroke. If you need less force, the next bore down is 63mm, providing 1402N both ways at 0.5MPa. If your application requires more power, stepping up to a 100mm bore yields 3681N both ways at 0.5MPa.
If your end position never changes, a fixed-stroke SED cylinder is sufficient and saves length. For replacing an ISO 15552 unit, match the 80mm bore, 75mm nominal stroke, PT3/8 port, and mounting choice from Basic, FA, LB, TC, FTC, TCM1, or TCM2. Note that the air cushion decelerates the load near stroke end but does not hold position on air loss; for fail-safe holding, use an external rod lock.
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 SEJ80X75-40S FAQ
A stop screw on the back rod mechanically shortens the retract stroke by up to 40mm. You can set the effective stroke anywhere from 35mm to 75mm, then lock it in place for precise end-position tuning.
Because the rod exits both ends, force is equal in both directions. It provides 2268N at 0.5MPa, 3175N at 0.7MPa, and a maximum of 463kgf at 1.0MPa.
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