Airtac SEJ Adjustable Cylinder SEJ32X125-50S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ32X125-50S 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 Ø32mm unit covers an effective stroke of 75–125mm without changing cylinders. Force is equal in both directions.
- BoreØ32 mm
- Nominal stroke125 mm
- Adjust window50 mm
- Effective stroke75–125 mm
- Port sizePT1/8
- CushionAdjustable, 27 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 SEJ32X125-50S
The AirTAC SEJ32X125-50S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 50 mm adjustable stroke window. A rod exits both ends, meaning the annulus area is identical in both directions. This provides an equal force of 345 N each way at 0.5 MPa, preventing drive-speed mismatch during retraction.
A stop screw on the back rod lets you mechanically dial the retract end position, giving an effective stroke range of 75 to 125 mm. The included -S magnet supports CMSE reed and DMSE electronic sensors for position feedback. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SEJ Adjustable Cylinder SEJ32X125-50S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ32X125-50S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø32 mm |
| Nominal stroke | 125 mm |
| Adjustment window | 50 mm (75–125 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/8 |
| Rod thread | M10×1.25 |
|---|---|
| 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, 27 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 (Ø32mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 346 N |
| 0.7 MPa | 484 N |
| Max (@1.0 MPa) | 70 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 SEJ32X125-50S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 32 | Bore size in mm. |
| ×125 | 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 SEJ32X125-50S Is Used
Machine Commissioning
Dial in the exact 75-125 mm end position during setup. The 345 N both-way force is perfect for pressing light assemblies without overshooting the stop.
Product Changeover
Quickly adapt the cylinder stroke when switching a line to different part heights, using the back-rod stop screw to set the new retract endpoint.
Trial Positioning
Test clamping locations on a fixture by adjusting the stroke over the 50 mm window before locking the stop screw for final production runs.
Is the Airtac SEJ Adjustable Cylinder SEJ32X125-50S the Right Cylinder?
The 50 mm adjustment window is ideal for fine-tuning a precise end position during machine commissioning or matching a variable stop. Stepping down to a 25 mm bore yields 169 N both ways at 0.5 MPa, while stepping up to a 40 mm bore provides 528 N both ways. If your application never requires stroke changes, a fixed-stroke SED cylinder is sufficient.
For strokes of 125 mm or longer, external guides are recommended to prevent side-load damage on the 12 mm rod. Remember that the adjustable air cushion and stop screw decelerate the load near stroke end but do not hold position on air loss; for fail-safe holding, use an external rod lock. Ensure your ISO 15552 replacement matches the 125 mm stroke, 50 mm window, PT1/8 port, and magnet options.
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 SEJ32X125-50S FAQ
The 50 mm adjustment window allows you to mechanically dial the retract stroke from 75 mm up to the nominal 125 mm using a stop screw on the back rod, which you lock after setting.
Because the rod exits both ends, force is equal in both directions: 345 N at 0.5 MPa, 483 N at 0.7 MPa, and a maximum of 70 kgf at 1.0 MPa.
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