Airtac SEJ Adjustable Cylinder SEJ40BX150-50S
The AirTAC SEJ Adjustable Cylinder SEJ40BX150-50S 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 50mm window, so this Ø40mm unit covers an effective stroke of 100–150mm without changing cylinders. Force is equal in both directions.
- BoreØ40 mm
- Nominal stroke150 mm
- Adjust window50 mm
- Effective stroke100–150 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 SEJ40BX150-50S
The AirTAC SEJ40BX150-50S is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod and an integrated magnet. A rod exits both ends, ensuring the output force is identical in both directions at 528 N each way at 0.5 MPa. The retract stroke is mechanically adjustable via a back-rod stop screw over a 50 mm window, yielding an effective stroke range of 100 to 150 mm.
This configuration uses a PT1/4 port and a Ø16 mm rod with an M12x1.25 thread. It includes field-adjustable air cushions at both ends to manage deceleration near the stroke limits. The -S magnet enables precise position sensing using CMSE reed or DMSE electronic sensors.
Airtac SEJ Adjustable Cylinder SEJ40BX150-50S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ40BX150-50S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 mm |
| Adjustment window | 50 mm (100–150 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 50mm 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 SEJ40BX150-50S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 40 | Bore size in mm. |
| ×150 | Nominal stroke length in mm. |
| -50 | 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 SEJ40BX150-50S Is Used
Packaging Flap Folding
Dial in the exact 100-150 mm retract stop to fold varying carton sizes, leveraging the 528 N both-way force to securely crease flaps without damaging the box.
Bottling Line Changeover
Rapidly adjust the mechanical end position within the 50 mm window when switching between different bottle heights, using the equal push/pull force for stable handling.
Lab Dispense Positioning
Set precise trial dispense heights against a stop. The SUS304 rod handles washdown environments while the magnet allows DMSE sensors to confirm the exact position.
Is the Airtac SEJ Adjustable Cylinder SEJ40BX150-50S the Right Cylinder?
Verify that the 50 mm adjustment window safely covers your required end-position variance. If you need less fine-tuning range, a smaller adjustment window or a fixed-stroke SED cylinder might suffice. For sizing neighbors, stepping down to a 32 mm bore yields 345 N both-way force at 0.5 MPa, while stepping up to a 50 mm bore provides 825 N.
This cylinder does not hold position on air loss; the stop screw and air cushions only set the mechanical end and decelerate the load. For fail-safe holding, consider an external rod lock. As a dimensionally interchangeable ISO 15552 cylinder, ensure your replacement matches the 40 mm bore, 150 mm nominal stroke, PT1/4 port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (50mm) 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 50mm 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 SEJ40BX150-50S FAQ
The retract stroke is adjustable up to 50 mm via a stop screw on the back rod. The effective stroke range is 100 to 150 mm. You set the exact end position on the machine and lock it in place.
Because it is a double-rod cylinder, the force is equal in both directions. It provides 528 N at 0.5 MPa, 739 N at 0.7 MPa, and a maximum of 108 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 SEJ40BX150-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.