Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75 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 SAIJ125X120-75
The AirTAC SAIJ125X120-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 45 to 120 mm, letting you dial back the nominal 120 mm stroke by up to 75 mm during commissioning. This bore delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
The extruded aluminum barrel features sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. It uses a PT tapered port and a 32 mm carbon steel rod with an M27x2 thread. The rear adjuster acts purely as a mechanical stop to fine-tune the end position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75 |
|---|---|
| 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 SAIJ125X120-75
| 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 SAIJ125X120-75 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 45 and 120 mm for multi-format packaging lines without physically changing the actuator.
Machine Setup and Changeover
Fine-tune the end position during commissioning to absorb mechanical tolerances in heavy fixtures weighing against the 6136 N thrust.
Product-Size Changes
Rear screw adjustment allows rapid adaptation of machinery to different product lengths, minimizing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-75 the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the required force, but a larger 160 mm bore is unnecessary. The 75 mm adjustment range is ideal for product-size changeovers on a line, allowing variable end-stops without swapping the cylinder or adding external stops. For load-holding without continuous air pressure, use an SAIL or BSAI cylinder, as the SAIJ adjuster is not a lock. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: 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 SAIJ125X120-75 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 120 mm nominal stroke down to as little as 45 mm. It sets the travel end but does not lock or hold the load without live air pressure.
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