Airtac SEJ Adjustable Cylinder SEJ50X75-40S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ50X75-40S 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 Ø50mm unit covers an effective stroke of 35–75mm without changing cylinders. Force is equal in both directions.
- BoreØ50 mm
- Nominal stroke75 mm
- Adjust window40 mm
- Effective stroke35–75 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 SEJ50X75-40S
The AirTAC SEJ50X75-40S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm adjustable stroke window. A rod exits both ends, yielding an identical annulus area for equal force and speed in both directions. You can dial the retract end from 35mm up to the nominal 75mm, providing 825 N of thrust each way at 0.5 MPa.
The retract position is set via a stop screw on the back rod, which you mechanically lock after fine-tuning the exact machine end-position. This extruded aluminum barrel design omits external tie rods, and the integrated -S magnet supports CMSE reed and DMSE electronic sensors for position feedback.
Airtac SEJ Adjustable Cylinder SEJ50X75-40S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ50X75-40S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 40 mm (35–75 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
|---|---|
| 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, 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 40mm window. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø50mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 825 N |
| 0.7 MPa | 1155 N |
| Max (@1.0 MPa) | 168 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 SEJ50X75-40S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 50 | 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 SEJ50X75-40S Is Used
Press Stroke Tuning
Dial in the 35-75mm stroke to precisely set the forming depth on a small press, leveraging the 825 N both-way force for consistent workpiece deformation.
Conveyor Stop Alignment
Fine-tune the retract stop position to match varying carton heights on a packaging conveyor, locking the back-rod screw once the exact 50mm height changeover is set.
Lab Probe Positioning
Adjust the end-point during trial positioning of a testing probe, ensuring the 1154 N retract force does not over-travel and damage delicate test samples.
Is the Airtac SEJ Adjustable Cylinder SEJ50X75-40S the Right Cylinder?
Confirm the 40mm adjustment window covers your required end-stop range; here, the effective retract stroke spans 35 to 75mm. If you need less force, the adjacent 40mm bore provides 528 N at 0.5 MPa; if your load demands more, step up to the 63mm bore for 1402 N at 0.5 MPa. If the exact stroke is fixed and never varies, a standard SED double-rod cylinder is sufficient. For ISO 15552 replacement matching, verify the 50mm bore, 75mm stroke, PT1/4 port, and mounting style. Note that the adjustable air cushion decelerates the load near stroke ends but is not a fail-safe lock; for position holding on air loss, use an external rod lock or BSED.
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 SEJ50X75-40S FAQ
The -40 code indicates a 40mm adjustment window. You can dial the retract stroke from a minimum effective stroke of 35mm up to the nominal 75mm by turning the stop screw on the back rod, then locking it in place.
Because the rod exits both ends, the annular area is identical in both directions. The force is equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and a maximum of 168 kgf at 1.0 MPa.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SEJ Cylinders
Request a Quote for Airtac SEJ Adjustable Cylinder SEJ50X75-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.