Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75
The AirTAC SAIJ125X425-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 425 mm nominal stroke that can be fine-tuned backward by up to 75 mm, yielding a practical usable travel window of 350 to 425 mm. This bore generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
Equipped with a SUS420J2 stainless steel rod (option A) and PT tapered ports, this unit operates at speeds of 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration omits the internal magnet, meaning CMSE or DMSE switches cannot be fitted without a model change.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-75 Is Used
Variable End-Stop Tuning
Dial in the exact 350-425 mm retract position during machine commissioning to accommodate varying product sizes without replacing hardware.
Heavy-Duty Changeover
Leverage 6136 N of thrust at 0.5 MPa to push heavy pallets or fixtures, adjusting the stroke back by up to 75 mm for different tooling widths.
Assembly Line Setup
Use the rear stopper to fine-tune the final position of large components on an assembly line, ensuring precise alignment without external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75 the Right Cylinder?
Select this 125 mm bore when an application requires substantial force—such as the 8590 N available at 0.7 MPa—combined with on-the-fly end-position tuning. The 75 mm rear adjuster screw allows operators to dial in the exact retract stop during machine setup or product changeover without bolting on external stops or swapping the cylinder. If an application requires less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa.
Because the nominal stroke is 425 mm, an external guide is recommended to prevent side-loading damage to the rod and seals. For load-holding requirements without live air pressure, note that the rear adjuster acts only as a travel stop, not a brake; an external rod lock or a related type like SAIL or BSAI would be required. To replace an ISO 15552 cylinder, match the 125 mm bore, 425 mm stroke, 75 mm adjustment, PT G1/2 port, and the specific mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ125AX425-75 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from the 425 mm nominal stroke down to as little as 350 mm. This stopper only sets the travel end and does not hold the load without live air pressure.
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