Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20S
The AirTAC SAIJ125X45-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 6136N push force at 0.5 MPa and uses a PT G1/2 port. The built-in magnet enables position sensing with CMSE reed or DMSE solid-state switches. Its SUS420J2 stainless steel rod offers good corrosion resistance for demanding environments.
With a 45 mm nominal stroke and a 20 mm adjustment range, you can fine-tune the retract end-position to create a precise 25-45 mm usable travel window. This eliminates the need for external stops during machine commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting options span Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125AX45-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125AX45-20S Is Used
Machine Changeover
Dial in the 25-45 mm travel window during product size changes without swapping out the entire cylinder.
End-Position Tuning
Use the rear stopper to fine-tune the retract position at commissioning, avoiding the need for external mechanical stops.
High-Force Positioning
Leverage the 6136N thrust capacity for moving heavy assemblies while precisely controlling the end-of-stroke placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513N push at 0.5 MPa) cannot deliver enough force. The 20 mm rear adjuster acts as a travel stop to dial in the 25-45 mm window during product changeover, but it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series. For strokes of 300 mm or more, an external guide is recommended to manage side loads.
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 SAIJ125AX45-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the 45 mm nominal stroke by up to 20 mm, giving a usable travel window of 25 to 45 mm for fine-tuning the end position.
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Standard models usually ship in 3-4 days.
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