Airtac SEJ Adjustable Cylinder SEJ80X75-75S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ80X75-75S 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 75mm window, so this Ø80mm unit covers an effective stroke of 0–75mm without changing cylinders. Force is equal in both directions.
- BoreØ80 mm
- Nominal stroke75 mm
- Adjust window75 mm
- Effective stroke0–75 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 SEJ80X75-75S
The AirTAC SEJ80X75-75S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 75 mm adjustable stroke window. A rod exits both ends, yielding identical annulus areas so output force is equal in both directions at 2268 N (0.5 MPa). By turning the stop screw on the back rod, you dial the retract end down from 75 mm to 0 mm, giving an effective stroke range of 0-75 mm without swapping hardware.
This extruded aluminum barrel omits external tie rods for a clean profile. It includes field-adjustable air cushions at both ends to decelerate the 25 mm rod near stroke end. The integrated -S magnet enables position detection with CMSE reed or DMSE electronic sensors.
Airtac SEJ Adjustable Cylinder SEJ80X75-75S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ80X75-75S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 75 mm (0–75 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 75mm 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 SEJ80X75-75S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 80 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -75 | 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 SEJ80X75-75S Is Used
Multi-Height Pallet Changeover
Dial the retract stroke from 0 to 75 mm to instantly adapt a 3175 N press head for varying pallet heights without changing cylinder hardware.
Welding Tip Gap Commissioning
Fine-tune the exact end position of a 25 mm rod during setup, locking the back-rod stop screw once the optimal electrode contact gap is found.
Variable Stop Forming Press
Leverage the equal 2268 N both-way force and adjustable 0-75 mm stroke to bend sheet metal parts to different depths on a single machine.
Is the Airtac SEJ Adjustable Cylinder SEJ80X75-75S the Right Cylinder?
Confirm the 75 mm adjustment window covers your required positioning range. If you need less force, stepping down to the 63 mm bore yields 1402 N at 0.5 MPa; stepping up to the 100 mm bore provides 3681 N both ways. If the end position never changes after commissioning, a fixed-stroke SED is sufficient.
For ISO 15552 replacement matching, verify the PT3/8 port, M20x1.5 rod thread, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that the air cushion and mechanical stop screw only decelerate and set the end position; they do 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 (75mm) 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 75mm 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 SEJ80X75-75S FAQ
A stop screw on the rear rod lets you mechanically shorten the retract stroke by up to 75 mm. The effective stroke range is 0-75 mm, allowing precise end-position tuning on the machine without replacing the cylinder.
Because it is a double-rod cylinder, force is identical in both directions: 2268 N at 0.5 MPa, 3175 N at 0.7 MPa, and a maximum of 463 kgf at 1.0 MPa.
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