Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20 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 SAIJ125AX120-20
The AirTAC SAIJ125X120-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a robust 6136 N push force at 0.5 MPa, making it suitable for heavy-duty operations. By turning the rear adjusting screw, you can trim the nominal 120 mm stroke back by up to 20 mm, creating a precise 100-120 mm usable travel window for exact end-position tuning.
This model features a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. While it lacks a standard magnet, the variable air cushions at both ends help decelerate heavy loads smoothly across its 30-500 mm/s speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20 |
|---|---|
| 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 SAIJ125AX120-20
| 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 SAIJ125AX120-20 Is Used
Machine Setup Changeover
Dial in the 100-120 mm travel window during product line changeovers to accommodate varying package sizes without replacing the cylinder.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy workpieces or pallets while fine-tuning the stopping point on the fly.
End-Position Calibration
Use the rear screw to precisely calibrate the retract end position during initial commissioning, avoiding the need for external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20 the Right Cylinder?
Select this 125 mm bore when a 100 mm bore falls short on power, as stepping up provides a significant thrust increase from 3927 N to 6136 N at 0.5 MPa. Choose this adjustable-stroke variant over a fixed SAI cylinder when your setup requires fine end-position tuning during commissioning or frequent product-size changeovers without swapping physical hardware. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Because the stroke is 120 mm, side-load risks are manageable, but always ensure proper external guiding for heavy loads. The rear adjuster acts strictly as a travel stop and does not hold the load without live air; for pilot-operated load holding, consider an external rod lock or the SAIL/BSAI series. To replace an existing ISO 15552 cylinder, match the 125 mm bore, 120 mm stroke, 20 mm adjustment, PT port threads, and required mounting hardware.
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 SAIJ125AX120-20 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 allows you to shorten the effective travel from the nominal 120 mm down to 100 mm. This creates a 100-120 mm adjustable window, letting you set the exact retract end position without changing the cylinder.
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