Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50S 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 SAIJ125X120-50S
The AirTAC SAIJ125X120-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 120 mm nominal travel by up to 50 mm. This yields a usable end-position window of 70-120 mm, giving you exact control over the retract distance without swapping out hardware. It delivers a robust 6136 N pull force at 0.5 MPa and features a carbon steel piston rod with an M27x2 thread for high side-load resilience.
Because this is an -S variant, it includes a magnet for use with AirTAC CMSE reed and DMSE electronic sensors, which seat neatly into the dual-side sensor grooves on the extruded aluminum barrel. The rear adjuster acts purely as a mechanical stop to set the travel end, working alongside the 40 mm variable air cushions at both ends to decelerate the load. It does not lock the position; if you need true load-holding without live air pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50S |
|---|---|
| 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 SAIJ125X120-50S
| 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 SAIJ125X120-50S Is Used
Variable End-Stop Tuning
Dial in the exact retract distance from 70 to 120 mm during machine commissioning to set precise pressing depths without adding external physical spacers.
Product Size Changeover
Quickly adapt a packaging or clamping station to different product lengths by turning the rear adjuster screw rather than replacing the entire cylinder.
Sensor-Ready Positioning
Leverage the built-in magnet with DMSE electronic sensors to confirm the adjusted end-position in automated assembly lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-50S the Right Cylinder?
Select this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) cannot provide enough clamping or lifting force, but you want to avoid stepping up to a massive 160 mm body. The 50 mm adjustment range is ideal for machine changeovers where product sizes vary, letting you fine-tune the retract stop on the fly instead of machining external spacers. For a fixed end-position without adjustability, the standard SAI series is the simpler choice.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 120 mm stroke, PT tapered port threads, and your required mounting accessory from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). This configuration omits FB, CA, CB, and CR mounts. The 120 mm stroke is short enough that side-loading is minimal, but always guide the load externally if it generates significant torque. Speeds range from 30-500 mm/s.
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 SAIJ125X120-50S FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster screw acts as a mechanical stop that can shorten the 120 mm nominal stroke by up to 50 mm, creating a usable travel window of 70 to 120 mm. It sets the end position but does not lock the load without live air pressure.
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