Airtac SEJ Adjustable Cylinder SEJ125X90-10S
The AirTAC Airtac SEJ Adjustable Cylinder SEJ125X90-10S 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 80–90mm without changing cylinders. Force is equal in both directions.
- BoreØ125 mm
- Nominal stroke90 mm
- Adjust window10 mm
- Effective stroke80–90 mm
- Port sizePT1/2
- CushionAdjustable, 40 mm
About the Airtac SEJ Adjustable Cylinder SEJ125X90-10S
The AirTAC SEJ125X90-10S is a double-acting, double-rod ISO 15552 profile cylinder. A rod exits both ends, making the annulus area identical for equal 5734 N output force both ways at 0.5 MPa. The integrated -S magnet supports CMSE reed and DMSE electronic sensors for position tracking.
This unit features a 10mm adjustable stroke window via a back-rod stop screw, allowing you to dial in the retract end position for an effective 80-90mm stroke. It includes field-adjustable air cushions at both ends to manage deceleration over the 40mm cushion length. The extruded aluminum barrel design omits external tie rods entirely.
Airtac SEJ Adjustable Cylinder SEJ125X90-10S Technical Specifications
| Model | Airtac SEJ Adjustable Cylinder SEJ125X90-10S |
|---|---|
| Series | SEJ ISO 15552 adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Nominal stroke | 90 mm |
| Adjustment window | 10 mm (80–90 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 SEJ125X90-10S
| SEJ | ISO 15552 double-rod double-acting cylinder with adjustable stroke. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SEJ125X90-10S Is Used
Press Brake Changeover
Dial in the 10mm retract window to match varying flange heights during sheet metal bending, utilizing the 5734 N both-way force for heavy clamping.
Injection Mold Separation
Fine-tune the 80-90mm effective stroke to break heavy molds free precisely, leveraging the equal push/pull force to prevent tooling binding.
Heavy Pallet Positioning
Adjust the mechanical stop on the packaging line to dial in exact pallet push-off distances without swapping out the entire cylinder hardware.
Is the Airtac SEJ Adjustable Cylinder SEJ125X90-10S the Right Cylinder?
Confirm the 10mm adjustment window covers your fine-tuning range before ordering. If sizing pressure, the adjacent bores at 0.5 MPa deliver 3681 N (100mm) or 8028 N (100mm at 0.7 MPa). If exact end positions are already fixed, a standard SED fixed-stroke cylinder is sufficient. For drop-in replacements, match the 125mm bore, 90mm stroke, PT1/2 port, and mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note: the air cushion only decelerates near stroke end; it does not hold position on air loss. For fail-safe holding, specify an external rod lock.
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 SEJ125X90-10S FAQ
A stop screw on the back rod lets you mechanically dial the retract stroke up to 10mm. This gives an effective stroke range of 80-90mm, which you lock in place during machine commissioning.
Because the double-rod design provides equal annulus area both ways, output force is identical in both directions: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and a maximum of 1169 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 usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SEJ Cylinders
Request a Quote for Airtac SEJ Adjustable Cylinder SEJ125X90-10S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.