Airtac SEJ Adjustable Cylinder SEJ40X75-75S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ40X75-75S 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 Ø40mm unit covers an effective stroke of 0–75mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke75 mm
- Adjust window75 mm
- Effective stroke0–75 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 SEJ40X75-75S
The AirTAC SEJ40X75-75S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 75 mm adjustable stroke window. A stop screw on the rear rod lets you dial the retract end from 0 mm up to 75 mm, providing exact end-position tuning during commissioning without changing hardware. Because a rod exits both ends, the annulus area is symmetric, delivering an equal 528 N of force each way at 0.5 MPa.
This extruded aluminum barrel omits external tie rods for a clean profile. It includes field-adjustable air cushions at both ends to decelerate the load near stroke end, and the built-in magnet (-S) supports CMSE reed and DMSE electronic sensors for position feedback.
Airtac SEJ Adjustable Cylinder SEJ40X75-75S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40X75-75S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 75 mm (0–75 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 75mm 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 SEJ40X75-75S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | 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 SEJ40X75-75S Is Used
Dispenser Probe Calibration
Dial the exact 0-75 mm retract position on a fluid dispensing probe, using the symmetric 528 N force to lift consistently without drift during product changeovers.
Variable Height Pallet Stops
Adjust the mechanical stop height for different pallet sizes on a conveyor line, fine-tuning the stroke window on the machine without swapping out cylinders.
Press Fit Commissioning
Micro-adjust the end position during light press-fit assembly, relying on the 30 mm cushion length to decelerate the 739 N force at 0.7 MPa before contact.
Is the Airtac SEJ Adjustable Cylinder SEJ40X75-75S the Right Cylinder?
Confirm this 75 mm adjustment window covers your required positioning range. If you need less force, the adjacent 32 mm bore provides 345 N both ways at 0.5 MPa; if you need more, step up to the 50 mm bore for 825 N. If the end position never changes after setup, a fixed-stroke SED cylinder is sufficient. Note that the air cushion and stop screw only set the mechanical end and decelerate the load; they do not hold position on air loss. For fail-safe holding, use an external rod lock. Match ISO 15552 replacements by verifying the 40 mm bore, PT1/4 port, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
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 SEJ40X75-75S FAQ
The stop screw on the rear rod allows you to adjust the retract stroke over a 75 mm window. The effective stroke can be dialed from 0 mm up to the nominal 75 mm, letting you set the precise end position directly on the machine.
Because the double-rod design provides equal force in both directions, it outputs 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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