Airtac SEJ Adjustable Cylinder SEJ40X75-20
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X75-20 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 Ø40mm unit covers an effective stroke of 55–75mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke75 mm
- Adjust window20 mm
- Effective stroke55–75 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 SEJ40X75-20
The AirTAC SEJ40X75-20 is a double-acting, double-rod ISO 15552 profile cylinder with a 20 mm adjustable stroke window. A stop screw on the rear rod lets you dial the retract end from 55 mm up to 75 mm, perfect for fine-tuning a machine position without machining new spacers. Because a rod exits both ends, the annular area is identical in both directions, yielding equal force of 528 N each way at 0.5 MPa.
This 40 mm bore unit features a PT1/4 port and a Ø16 mm rod with an M12x1.25 thread. Field-adjustable air cushions at both ends decelerate the load near stroke end. This SKU omits the magnet, so it does not support CMSE or DMSE position sensors without modification. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SEJ Adjustable Cylinder SEJ40X75-20 Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X75-20 |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 20 mm (55–75 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 20mm 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 SEJ40X75-20
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | 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 SEJ40X75-20 Is Used
Pick-and-Place Z-Axis
Dial the 55-75 mm retract to set precise drop heights for varying component thicknesses, utilizing the equal 528 N both-way force to lift and place reliably.
Forming Stop Gauge
Adjust the mechanical end stop during machine commissioning to match die heights perfectly, avoiding the need to swap out physical spacer rings on the line.
Packaging Changeover
Quickly reposition the retract stroke when switching between different carton sizes, using the rear stop screw to lock the new 75 mm max end position in place.
Is the Airtac SEJ Adjustable Cylinder SEJ40X75-20 the Right Cylinder?
Confirm the 20 mm adjustment window covers your required end-position range. If you need less force, the adjacent 32 mm bore provides 345 N at 0.5 MPa; if you need more, stepping up to the 63 mm bore yields 1402 N at 0.5 MPa. If your stroke never changes after commissioning, a fixed-stroke SED saves length and cost. Remember that the adjustable cushion and stop screw decelerate the load but do not hold position on air loss; use an external rod lock for fail-safe holding. As a true ISO 15552 cylinder, you can match it by bore, stroke, port, and mounting.
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 SEJ40X75-20 FAQ
A stop screw on the back rod mechanically limits the retract stroke. For the SEJ40X75-20, you can adjust the effective stroke anywhere from 55 mm up to the nominal 75 mm, then lock it down.
Because it is a double-rod cylinder, the force is identical in both directions: 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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