Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30
The AirTAC SAIJ125X120-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 120 mm nominal travel to a precise 90-120 mm usable window. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it a robust choice for heavy-duty positioning. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
This adjustable variant omits the FB, CA, CB, and CR mounting attachments, offering a streamlined set of ISO 15552 interfaces including Basic, FA, LB, TC, FTC, TCM1, and TCM2. The standard carbon steel rod and PT tapered port threads ensure reliable operation, while the variable air cushions at both ends work alongside the rear stopper to fine-tune end-position deceleration during commissioning.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125X120-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125X120-30 Is Used
Machine Changeover
Quickly adjust the retract end-position by up to 30 mm during product size transitions on the line, setting exact 90 to 120 mm travel limits without changing hardware.
Heavy Press Assembly
Leverage 6136 N of thrust at 0.5 MPa for pressing operations, using the rear screw to fine-tune the final approach distance and compensate for material thickness variations.
Variable End-Stop Dosing
Set precise discharge positions for heavy bulk materials, dialing back the stroke in the 90-120 mm window to alter dispensing volumes without reprogramming the PLC.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30 the Right Cylinder?
Select this 125 mm bore model when an application requires high thrust combined with variable end-stops, avoiding the need to swap cylinders during product changeover. If your force requirements are lower, stepping down to the 100 mm bore yields 3927 N of push force at 0.5 MPa, but the SAIJ125X120-30 provides the necessary margin for heavier payloads. Because the 120 mm stroke is under 300 mm, side-load stress on the 32 mm rod thread is minimized, though external guides are still recommended for lateral loads.
The rear adjuster acts purely as a mechanical travel stop and does not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL pneumatic lock or BSAI clamp-lock variants. To match this cylinder for an ISO 15552 replacement, verify the 125 mm bore, 120 mm stroke, 30 mm adjustment range, PT port thread, and the specific mounting accessory required.
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 SAIJ125X120-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stopper that lets you shorten the effective travel from the 120 mm nominal stroke down to as little as 90 mm. It functions as an end-position tuner and deceleration stop, not a lock, so live air is still required to hold the load.
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