Airtac SEJ Adjustable Cylinder SEJ125BX100-75S
The AirTAC SEJ Adjustable Cylinder SEJ125BX100-75S 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 Ø125mm unit covers an effective stroke of 25–100mm without changing cylinders. Force is equal in both directions.
- BoreØ125 mm
- Nominal stroke100 mm
- Adjust window75 mm
- Effective stroke25–100 mm
- Port sizePT1/2
- CushionAdjustable, 40 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 SEJ125BX100-75S
The AirTAC SEJ125BX100-75S is a double-acting, double-rod ISO 15552 profile cylinder engineered for high-force washdown duty. It features a SUS304 stainless steel rod on both ends, delivering equal force in both directions—5734 N at 0.5 MPa and 8028 N at 0.7 MPa. A built-in magnet (-S) supports CMSE reed and DMSE electronic sensors for precise position tracking.
The rear rod integrates a mechanical stop screw with a 75 mm adjustment window, allowing you to dial the retract stroke down from 100 mm to a 25 mm minimum. This on-machine fine-tuning eliminates hardware swaps during changeovers. The extruded aluminum barrel omits external tie rods for a clean profile, and field-adjustable air cushions at both ends manage deceleration over the 40 mm cushion length.
Airtac SEJ Adjustable Cylinder SEJ125BX100-75S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ125BX100-75S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Nominal stroke | 100 mm |
| Adjustment window | 75 mm (25–100 mm) |
| Configuration | Double rod, double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
|---|---|
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 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 (Ø125mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 5734 N |
| 0.7 MPa | 8027 N |
| Max (@1.0 MPa) | 1169 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 SEJ125BX100-75S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SEJ125BX100-75S Is Used
Heavy Press Changeover
Dial the 75 mm stop screw to match varying metal sheet thicknesses in a hydraulic press, using the 5734 N both-way force to retract the double rod reliably.
Washdown Cartoning
Leverage the SUS304 rod for corrosion resistance in food-packaging lines, adjusting the end position on the fly to handle different carton depths without swapping hardware.
Bending Fixture Tuning
Fine-tune the retract stop during commissioning of an automotive bending fixture, relying on the 8028 N both-way output to hold the bend profile securely.
Is the Airtac SEJ Adjustable Cylinder SEJ125BX100-75S the Right Cylinder?
Confirm the 75 mm adjustment window covers your positioning range; this cylinder dials the retract end from 25 mm up to 100 mm. If you need less force, the 100 mm bore provides 3681 N at 0.5 MPa. If you need more, step up to the 125 mm bore's maximum 1169 kgf at 1.0 MPa. For fixed-position tasks without washdown exposure, a standard SED fixed-stroke cylinder may suffice.
When replacing an ISO 15552 unit, match the 125 mm bore, 100 mm stroke, PT1/2 port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the adjustable air cushion only decelerates the load near stroke end; it is not a mechanical lock. A plain SEJ will not hold position on air loss, so specify an external rod lock for fail-safe holding.
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 SEJ125BX100-75S FAQ
A stop screw on the back rod lets you mechanically shorten the retract stroke by up to 75 mm. The effective stroke range is 25 mm to 100 mm. You lock the screw after setting the exact end position needed for your application.
Because it is a double-rod cylinder, the force is identical in both directions. It delivers 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and a maximum of 1169 kgf at 1.0 MPa.
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