Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm stroke, G1/2 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75
The AirTAC SAIJ125X280-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its 280mm nominal stroke can be dialed back by up to 75mm, creating a precise 205-280mm usable travel window for product changeovers. This model features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and uses a PT tapered port thread.
Because the rear adjuster acts purely as a mechanical stop, it cannot hold a load without live air pressure; for dead-air load holding, an external pilot-operated check valve or a related SAIL lock cylinder is required. The extruded aluminum barrel includes sensor grooves on both sides, and with a 32mm rod diameter paired with an M27x2 thread, this size handles substantial side loads compared to smaller bores.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| 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 |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
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 SAIJ125 Adjustable Cylinder SAIJ125AX280-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75 Is Used
Variable Product Changeover
Dial in the 205-280mm stroke window on the fly to accommodate different package lengths on a packaging line without changing out the cylinder.
Heavy Forming End-Stop
Use the rear mechanical stopper to set a precise retract position for a 6136N pressing or forming operation, ensuring repeatable depth at 0.5 MPa.
Machine Commissioning
Fine-tune the travel limit during initial machine setup to clear mechanical interference without machining new spacer blocks or ordering custom cylinders.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75 the Right Cylinder?
Choose this 125mm bore when an 80mm bore (providing 2513N push at 0.5 MPa) is insufficient, but a 160mm bore (10053N) would overdrive your payload. The 75mm adjustment range is ideal for machines running mixed product lengths, allowing you to fine-tune the retract end position during commissioning without adding external stops or swapping to a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify the 125mm bore, 280mm stroke, 75mm adjustment, PT port thread, and your required mounting accessory.
With a 280mm stroke, the unsupported piston rod is subject to bending forces under heavy lateral loads. Even though the 32mm rod provides high rigidity, you should incorporate an external guide rail to prevent premature seal wear. Approved mounting accessories for this adjustable series include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for 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 (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If pressure is increased to 0.9 MPa, the push force reaches 11045N.
The rear adjuster screw acts as a mechanical stop that shortens the effective retract stroke by up to 75mm. This turns the 280mm nominal stroke into a 205-280mm usable travel window, allowing you to set the exact end position during commissioning. It does not lock the load without air pressure.
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