Airtac SEJ Adjustable Cylinder SEJ32BX125-30S
The AirTAC SEJ Adjustable Cylinder SEJ32BX125-30S 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 30mm window, so this Ø32mm unit covers an effective stroke of 95–125mm without changing cylinders. Force is equal in both directions.
- BoreØ32 mm
- Nominal stroke125 mm
- Adjust window30 mm
- Effective stroke95–125 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 SEJ32BX125-30S
The AirTAC SEJ32BX125-30S is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod for corrosion resistance. A rod exits both ends, ensuring the annular area is identical in both directions. This yields an equal force of 345 N each way at 0.5 MPa, preventing speed discrepancies between extend and retract strokes.
The -30 designation provides a 30 mm adjustable stroke window, meaning your effective retract stroke can be dialed from 95 mm up to 125 mm. A mechanical stop screw on the back rod lets you fine-tune the end position directly on the machine, after which you lock it down. The integrated -S magnet enables position sensing with CMSE reed or DMSE electronic sensors.
Airtac SEJ Adjustable Cylinder SEJ32BX125-30S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ32BX125-30S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø32 mm |
| Nominal stroke | 125 mm |
| Adjustment window | 30 mm (95–125 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 30mm 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 SEJ32BX125-30S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 32 | Bore size in mm. |
| ×125 | Nominal stroke length in mm. |
| -30 | 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 SEJ32BX125-30S Is Used
Packaging Machine Setup
Dial in the exact 95-125 mm pressing stroke on a packaging line during commissioning, utilizing the 345 N both-way force to seal cartons without crushing them.
Food Processing Changeover
The SUS304 rod withstands washdowns, while the 30 mm stroke window allows rapid changeover to different product heights on a stainless steel conveyor sorting mechanism.
Assembly Trial Positioning
Fine-tune the retract stop on a small pneumatic press to find the perfect seating depth for delicate bearings, locking the back-rod screw once the 483 N @0.7 MPa force is perfectly applied.
Is the Airtac SEJ Adjustable Cylinder SEJ32BX125-30S the Right Cylinder?
Verify that the 30 mm adjustment window covers your required end-position range; if you need less travel, a fixed-stroke SED is sufficient. For sizing, stepping down is not an option as 32 mm is the smallest bore. Stepping up to a 40 mm bore yields 528 N at 0.5 MPa if your load requires more force. The plain SEJ cylinder does not hold position on air loss; the adjustable air cushion and stop screw only decelerate the load and set the mechanical end. For fail-safe holding, use a BSED or an external rod lock. Ensure your ISO 15552 replacement matches the 125 mm stroke, 30 mm window, PT1/8 port, and SUS304 rod.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (30mm) 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 30mm 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 SEJ32BX125-30S FAQ
A stop screw on the rear rod lets you mechanically shorten the retract stroke by up to 30 mm. The effective stroke range is 95-125 mm, which you set and lock on the machine.
Because it is a double-rod cylinder, the 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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Covers non-human-caused product damage.
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