Airtac SEJ Adjustable Cylinder SEJ125BX75-10S
The AirTAC SEJ Adjustable Cylinder SEJ125BX75-10S 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 10mm window, so this Ø125mm unit covers an effective stroke of 65–75mm without changing cylinders. Force is equal in both directions.
- BoreØ125 mm
- Nominal stroke75 mm
- Adjust window10 mm
- Effective stroke65–75 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 SEJ125BX75-10S
The AirTAC SEJ125BX75-10S is a double-acting, double-rod ISO 15552 profile cylinder featuring a SUS304 stainless steel rod on both ends for corrosion resistance. A mechanical stop screw on the back rod lets you dial the retract stroke over a 10 mm window, yielding an effective stroke range of 65 to 75 mm. This allows precise end-position tuning directly on the machine without swapping hardware.
Because the rod exits both ends, the annulus area is identical in both directions, delivering an equal force of 5734 N each way at 0.5 MPa. The extruded aluminum barrel contains no external tie rods, and adjustable air cushions at both ends decelerate the 32 mm rod near stroke ends. The built-in magnet supports CMSE reed and DMSE electronic sensors for position feedback.
Airtac SEJ Adjustable Cylinder SEJ125BX75-10S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ125BX75-10S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Nominal stroke | 75 mm |
| Adjustment window | 10 mm (65–75 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 10mm 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 SEJ125BX75-10S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -10 | 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 SEJ125BX75-10S Is Used
Washdown Diverter Gates
Drives stainless diverter gates in food processing lines. The SUS304 rod withstands caustic washdowns, while the 10 mm stroke adjustment fine-tunes the gate seal against the 5734 N retract force.
Heavy Press Positioning
Sets the bottom stop on heavy-duty forming presses. Operators dial the 65-75 mm effective stroke to accommodate different material thicknesses, utilizing the full 8028 N both-way force at 0.7 MPa.
Marine Component Changeover
Actuates clamping arms for marine hardware machining. The equal-force double rod manages heavy part ejection, and the stainless construction resists salt-spray corrosion during fixture changeovers.
Is the Airtac SEJ Adjustable Cylinder SEJ125BX75-10S the Right Cylinder?
Verify this 10 mm adjustment window covers your required end-position variance. If you need less force, the neighboring bore down is 100 mm, providing 3681 N both ways at 0.5 MPa; stepping up is not applicable as 125 mm is the largest SEJ size. If your application never requires stroke adjustment, a fixed-stroke SED double-rod cylinder provides identical equal-force output in a shorter overall length.
For ISO 15552 dimensional replacements, match the 125 mm bore, 75 mm stroke, PT1/2 port, and your specific mounting choice from the SEJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the adjustable cushion only decelerates the load near the stroke end; it does not hold position on air loss, so an external rod lock is required for fail-safe holding.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Adjustment window (10mm) 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 10mm 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 SEJ125BX75-10S FAQ
A stop screw on the rear rod mechanically limits the retract travel. For this model, you can dial the stroke down by up to 10 mm, creating an effective stroke range of 65 to 75 mm. You lock the screw after setting the exact end position required by your machine.
Because it is a double-rod cylinder, the force is equal in both extend and retract directions. It provides 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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