Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-30
The AirTAC SAIJ125X35-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N thrust at 0.5 MPa. By incorporating a 30mm adjustment mechanism on a 35mm nominal stroke, it creates a highly versatile 5 to 35mm usable travel window. This built-in adjustability allows operators to fine-tune the retract end-position directly at commissioning without adding external stops or swapping out the entire cylinder.
Designed for heavy-duty applications, this 125mm bore unit utilizes a G1/2 port and a 32mm carbon steel piston rod to handle substantial side loads effectively. The extruded aluminum barrel features dual sensor grooves, supporting AirTAC CMSE reed and DMSE electronic switches for precise position feedback. It supports a focused mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2 configurations, deliberately omitting FB, CA, CB, and CR options to streamline the adjustable profile design.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125X35-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125X35-30 Is Used
Machine Changeover
Dial in the exact 5 to 35mm retract position during product-size changeovers on a packaging line without physically swapping cylinders or repositioning external mechanical stops.
End-Stop Tuning
Fine-tune the final resting position of heavy fixtures during machine commissioning, using the 30mm rear adjustment screw to compensate for mechanical tolerances.
Variable Stroke Clamping
Apply the 6136N clamping force at precise, variable depths on heavy assemblies, adjusting the stroke back from 35mm to 5mm as needed for different workpiece heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-30 the Right Cylinder?
Choose this 125mm bore adjustable-stroke cylinder when your application requires significant force—6136N push and 5734N pull at 0.5 MPa—combined with exact end-position tuning. If your process demands less force, stepping down to a 100mm bore provides 3927N push, whereas moving up to a 160mm bore yields 10053N. The adjustable stroke is specifically beneficial for machine setups requiring variable end-stops or frequent product-size changeovers, eliminating the need to physically replace a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, ensure you match the 125mm bore, 35mm nominal stroke, 30mm adjustment range, PT tapered port threads, and the standard carbon steel rod. Because this is a standard double-acting cylinder, the rear adjuster functions strictly as a mechanical travel stop to decelerate the load, not as a locking device. The cylinder cannot hold a load without continuous live air pressure; for true fail-safe load holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X35-30 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore double-acting cylinder provides a push force of 6136N and a pull force of 5734N. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw acts as a mechanical stop that lets you trim the effective retract travel. On this 35mm nominal stroke, the 30mm adjustment creates a usable travel window from 5mm to 35mm, allowing precise end-position tuning without replacing the cylinder.
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