Airtac SE125 Standard Cylinder SE125X303SN
The AirTAC Airtac SE125 Standard Cylinder SE125X303SN is a genuine double-acting ISO 15552 / VDMA 24562 profile-barrel air cylinder with a Ø125mm bore and 303mm stroke, PT1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke303 mm
- Port sizePT1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SE125 Standard Cylinder SE125X303SN
The AirTAC SE125X303SN is a double-acting single-rod ISO 15552 profile cylinder built for heavy-duty automation. It delivers a substantial 6136 N push force at 0.5 MPa, utilizing a 125 mm bore and a 303 mm stroke. The extruded aluminum barrel design omits external tie rods, yielding a compact, corrosion-resistant body that mounts flush against machine frames without snagging adjacent components.
Equipped with a built-in magnet (-S), this unit supports AirTAC CMSE reed and DMSE electronic sensors for precise end-of-stroke detection. The NBR seal handles standard operating temperatures, while the field-adjustable pneumatic cushioning at both ends allows technicians to tune deceleration and soften hard end stops dynamically.
Airtac SE125 Standard Cylinder SE125X303SN Technical Specifications
| Model | Airtac SE125 Standard Cylinder SE125X303SN |
|---|---|
| Series | SE ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 303 mm |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| 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 |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SE series datasheet and ISO 15552 / VDMA 24562 dimensions. Confirm against the product label before installation. Port options: PT (standard) / G (BSPP).
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SE125 Standard Cylinder SE125X303SN
| SE | ISO 15552 / VDMA 24562 profile-barrel double-acting cylinder. |
|---|---|
| 125 | Bore size in mm. |
| ×303 | Stroke length in mm. |
| -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: Basic, LB, FA, FB, CA, CB, CR, TC, FTC, TCM1, TCM2. Related SE-family variants: SED (double rod), SEJ (adjustable stroke), BSE (rod lock), BSED (double-rod rod lock).
Where the Airtac SE125 Standard Cylinder SE125X303SN Is Used
Plastic Injection Mold Separation
Provides the 6136 N push force required to break the vacuum and separate large injection molding tooling halves during initial open strokes.
Heavy Press Brake Actuation
Drives the upper beam downstroke in heavy-gauge metal press brakes, utilizing the 303 mm stroke to clear thick workpieces before forming.
Palletizer Pallet Ejection
Ejects finished pallets from high-capacity palletizer stations, using the robust 125 mm bore to overcome the inertia of full loads.
Is the Airtac SE125 Standard Cylinder SE125X303SN the Right Cylinder?
Generating 6136 N of thrust at 0.5 MPa, this 125 mm bore cylinder sits at the top of the SE range, making it the choice when the next size down (100 mm, offering 3927 N push) cannot move the load. If a task requires less force, stepping down to the 100 mm bore saves space and air consumption.
Because the 303 mm stroke exceeds 300 mm, the 32 mm rod and rod-bearing face bending stress under high side loads; an external guide rail is recommended to prevent premature wear. Remember that the adjustable air cushion only decelerates the piston near the stroke end—it is not a mechanical lock. If your application must hold a load vertically without live air pressure, integrate a BSE rod lock or external pilot-operated check valve. For retrofitting, verify the PT1/2 port, 303 mm stroke, and ISO 15552 mounting interface dimensions.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/G)
- ✓ Magnet (-S) for CMSE/DMSE sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (LB/FA/FB/CA/CB/CR/TC/FTC/TCM1/TCM2).
- check Installation by qualified personnel per AirTAC docs.
Airtac SE125 Standard Cylinder SE125X303SN FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. At 0.7 MPa, the push force reaches 8590 N. The maximum allowable push force is 1252 kgf at 1.0 MPa.
No. The SE125X303SN is a double-acting cylinder with adjustable air cushions that only decelerate the piston near the stroke end; it does not lock the rod. If you need to hold a load without continuous air pressure, use an AirTAC BSE series rod lock or an external pilot-operated check valve.
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