Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 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 SAIJ125X120-20
The AirTAC SAIJ125X120-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 6136N push force at 0.5 MPa and utilizes a 32mm carbon steel rod with an M27x2 thread to handle high side loads. The integrated rear stopper allows you to trim the effective travel down by up to 20mm, creating a precise 100-120mm usable window for end-position tuning.
Unlike fixed-stroke actuators, this model allows you to fine-tune the retract position at commissioning or during product changeovers without swapping the cylinder or adding external stops. It features a PT tapered G1/2 port, dual-sided sensor grooves for mounting CMSE or DMSE switches, and variable air cushions at both ends to decelerate heavy 125mm bore loads. The rear adjuster acts purely as a mechanical stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 |
|---|---|
| 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 SAIJ125X120-20
| 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 SAIJ125X120-20 Is Used
Machine Changeover
Dial in the exact 100-120mm retract position during product size changes without disassembling tooling or installing external mechanical stops.
Heavy Pressing
Delivers 6136N of thrust at 0.5 MPa for high-force pressing and forming operations requiring precise end-position calibration.
Assembly Stations
Provides reliable double-acting motion with variable air cushions to decelerate heavy payloads at the end of every stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 the Right Cylinder?
Choose this 125mm bore actuator when an application demands high force, generating 6136N push and 5734N pull at 0.5 MPa, alongside precise end-stop tuning. If your setup requires less force, stepping down to an 80mm bore yields 2513N push at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N for heavier loads. The adjustable 100-120mm travel window is ideal for variable product sizes on a line, replacing the need for fixed SAI cylinders when exact end positions fluctuate.
This profile cylinder supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR configurations. It operates at speeds of 30-500mm/s. For applications requiring true load-holding without live air pressure, note that the rear adjuster is a stop, not a lock; you should consider an external rod lock, a pilot-operated check valve, or AirTAC SAIL and BSAI clamp-lock cylinders.
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 SAIJ125X120-20 FAQ
A rear-mounted adjusting screw acts as a mechanical stopper, allowing you to shorten the nominal 120mm stroke by up to 20mm. This creates a 100-120mm adjustable travel window for fine-tuning the end position at commissioning without changing the cylinder.
At 0.5 MPa operating pressure, the SAIJ125X120-20 provides 6136N of push force and 5734N of pull force. It can deliver up to 11045N of push force at 0.9 MPa.
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