Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50 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 SAIJ125X120-50
The AirTAC SAIJ125X120-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5MPa and uses a PT tapered port. The integrated adjuster allows you to trim the effective travel back by up to 50mm, creating a 70-120mm usable stroke window without swapping hardware.
This 125mm bore unit incorporates a 32mm carbon steel rod and achieves a standard operating speed of 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic switches when a magnet is specified. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50 |
|---|---|
| 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 SAIJ125X120-50
| 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 SAIJ125X120-50 Is Used
Variable End-Stop Clamping
Dial in the exact clamping depth for parts of varying heights by adjusting the rear stopper from 70 to 120mm, ensuring optimal force without repositioning the cylinder.
Product Size Changeover
Quickly adapt automated lines to new product dimensions by turning the rear screw, trimming the stroke precisely during commissioning without adding external mechanical stops.
Heavy Load Positioning
Leverage the 6136N push force to move heavy pallets or assemblies into a precise inspection station, using the adjustable travel window to fine-tune the resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50 the Right Cylinder?
Select this 125mm bore actuator when an application requires heavy thrust combined with variable end-positioning. If 6136N at 0.5MPa is excessive, stepping down to an 80mm bore yields 2513N. Conversely, if 120mm of travel is insufficient, a larger SAIJ variant can be evaluated. The rear adjustment mechanism is strictly a travel stop, not a locking device; it cannot hold a load without live air pressure. For fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder.
Because the nominal stroke is 120mm, an external guide is not mandatory, but the 32mm rod thread provides high rigidity against moderate side loads. Ensure your setup matches the PT port thread, the 50mm adjustment range, and the ISO 15552 mounting footprint for a seamless machine changeover.
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 SAIJ125X120-50 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the 120mm nominal stroke by up to 50mm. This creates a usable travel window of 70-120mm, allowing you to fine-tune the end position during setup without replacing the cylinder.
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