Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-50
The AirTAC SAIJ125X105-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. Its 105 mm nominal stroke can be dialed back by up to 50 mm, creating a precise 55-105 mm usable travel window for product changeovers. This bore features a robust 32 mm carbon steel piston rod and a PT tapered G1/2 port.
Because the adjuster acts purely as a mechanical stop, it does not hold the load without live air pressure. The extruded aluminum barrel includes dual sensor grooves, and while this configuration omits a magnet, adding an -S suffix enables compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAIJ125X105-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SAIJ125X105-50 Is Used
Variable End-Stop Forming
Dial in the 55-105 mm stroke window to accommodate different material thicknesses in metal forming or bending presses without changing the actuator.
Machine Changeover
Quickly reposition the rear mechanical stop during product size changeovers on packaging lines, reducing setup time while maintaining heavy 6136 N thrust.
Heavy Assembly Positioning
Securely push large components into place on an assembly conveyor, relying on the 32 mm carbon steel rod to handle significant side loads during insertion.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-50 the Right Cylinder?
Select this 125 mm bore when an application requires heavy thrust (6136 N push at 0.5 MPa) that exceeds the 3927 N capacity of a 100 mm cylinder, but does not warrant stepping up to a 160 mm bore. The adjustable 55-105 mm travel window is ideal for machines processing multiple product sizes, allowing operators to fine-tune end positions at commissioning without swapping cylinders or adding external stops.
For replacement, verify the 105 mm stroke, 50 mm adjustment range, PT port thread, and mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If the machine requires true load-holding without continuous air, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead, as the SAIJ rear stopper is not a brake.
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 SAIJ125X105-50 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that shortens the 105 mm nominal stroke by up to 50 mm, providing a usable travel window of 55 to 105 mm. It only sets the end position and does not lock the load without air pressure.
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