Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30
The AirTAC SAIJ125X50-30 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It provides a usable travel window of 20 to 50 mm, letting you dial back the 50 mm nominal stroke by up to 30 mm during machine setup. In the 125 mm bore class, it generates a substantial 6136 N push force and 5734 N pull force at 0.5 MPa. The extruded aluminum barrel features dual-side sensor grooves, and because this unit lacks the -S magnet suffix, it operates without internal position sensing.
The rear adjuster functions strictly as a travel stop to set the end position, not as a load-holding brake. For load holding without live air pressure, you would need a different unit like the SAIL or BSAI series. This model uses a PT tapered port thread, a 32 mm carbon steel piston rod with an M27x2 rod thread, and relies on a 40 mm variable air cushion at both ends to absorb kinetic energy. Its mounting options cover the standard SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125X50-30 Is Used
Variable End-Stop Setup
Fine-tune the retraction end position within a 20 to 50 mm window to adapt machinery for varying product lengths without changing the cylinder.
Heavy-Duty Changeover
Leverage 6136 N of push force at 0.5 MPa to press or support heavy workpieces while adjusting the stopper to match new tooling dimensions.
Position Calibration
Dial in the exact end-of-stroke contact point during commissioning to prevent mechanical crashes and ensure precise product placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires heavy thrust but variable end-stop positioning, such as accommodating different product sizes on a single line. If you need less force, stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N. Stepping up to a 160 mm bore raises it to 10053 N. The adjustable stroke prevents the need to physically swap cylinders or bolt on external stops during changeovers.
When specifying this ISO 15552 interchangeable replacement, verify the 50 mm nominal stroke, the 30 mm adjustment range, the PT G1/2 port, and the carbon steel rod material. Since the standard stroke is 50 mm, side-loading is minimal, but the 32 mm rod and M27x2 thread provide excellent structural rigidity. The operating speed is 30-500 mm/s, which is lower than smaller bores due to the larger internal air volume.
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 SAIJ125X50-30 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 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 stroke from 50 mm down to 20 mm. This provides a 20-50 mm usable travel window for fine-tuning end positions without replacing the cylinder.
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