Airtac SEJ Adjustable Cylinder SEJ40X75-30S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X75-30S 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 30mm window, so this Ø40mm unit covers an effective stroke of 45–75mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke75 mm
- Adjust window30 mm
- Effective stroke45–75 mm
- Port sizePT1/4
- CushionAdjustable, 30 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 SEJ40X75-30S
The AirTAC SEJ40X75-30S is a double-acting, double-rod ISO 15552 profile cylinder. A rod exits both ends, yielding identical annulus areas so output force is equal in both directions at 528 N each way at 0.5 MPa. A stop screw on the back rod lets you dial the retract stroke over a 30 mm window, providing an effective stroke range of 45 to 75 mm.
This extruded aluminum barrel design omits external tie rods for a clean profile. It includes field-adjustable air cushions at both ends to decelerate loads near the stroke extremes. The integrated -S magnet enables position detection with CMSE reed or DMSE electronic sensors.
Airtac SEJ Adjustable Cylinder SEJ40X75-30S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X75-30S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 30 mm (45–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
|---|---|
| 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, 30 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 30mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø40mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 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 SEJ40X75-30S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -30 | 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 SEJ40X75-30S Is Used
Clamp Depth Tuning
Dial in the 45-75 mm stroke precisely during machine commissioning to match varying material thicknesses without swapping hardware, using 528 N of clamping force.
Changeover Adjustment
Rapidly reposition the retract stop for product changeovers on a packaging line, leveraging the 30 mm window to adapt end positions quickly.
Trial Positioning
Test pick-and-place end stops in prototype assembly machinery, fine-tuning the exact retract point before locking the back-rod screw permanently.
Is the Airtac SEJ Adjustable Cylinder SEJ40X75-30S the Right Cylinder?
Confirm the 30 mm adjustment window covers your required end-position variance. If 528 N at 0.5 MPa is insufficient, step up to the 50 mm bore (825 N both ways); if oversized, step down to the 32 mm bore (345 N). If your stroke never varies, a fixed-stroke SED cylinder is enough. For drop-in replacements, match the 40 mm bore, 75 mm stroke, PT1/4 port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note: air cushions only decelerate; this cylinder does not hold position on air loss.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (30mm) 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 30mm 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 SEJ40X75-30S FAQ
A mechanical stop screw on the rear rod lets you shorten the retract stroke by up to 30 mm. The effective stroke range is 45 to 75 mm. You dial in the exact end position and lock it, which is ideal for fine-tuning on the machine.
Because a rod exits both ends, force is equal in both directions. It generates 528 N at 0.5 MPa, 739 N at 0.7 MPa, and a maximum of 108 kgf at 1.0 MPa.
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