Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20S
The AirTAC SAIJ125X135-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the effective travel window down to 115-135 mm during commissioning. It delivers robust performance with 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty handling.
This specific configuration features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a magnet for electronic DMSE or reed CMSE position sensing. Fluid ports are PT tapered thread type (G1/2), and the extruded aluminum barrel design integrates sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-20S Is Used
Machine Setup Calibration
Dial in the exact 115-135 mm end-stop during initial machine commissioning to perfect pressing or clamping positions without machining custom spacers.
Product Size Changeover
Quickly adjust the travel limit on a packaging line when product dimensions change, using the 20 mm rear adjuster to accommodate varying package lengths.
Heavy Material Handling
Leverage the 6136 N push force to move heavy pallets or workpieces, using the adjustable stroke to fine-tune the release position safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20S the Right Cylinder?
Select this 125 mm bore when an application requires over 6000 N of thrust at 0.5 MPa but does not necessitate stepping up to the 160 mm bore, which offers 10053 N. The adjustable stroke is ideal for product changeovers on a line, letting you dial in the end position by up to 20 mm without adding external stops or swapping out a fixed-stroke SAI cylinder. Because the nominal stroke is 135 mm, side-loading is minimal, but an external guide is still recommended for heavy loads.
For load-holding applications, note that the rear adjuster acts only as a mechanical travel stop and the air cushions solely manage end-of-stroke deceleration; neither will hold a load without live air pressure. For true pneumatic locking, consider the SAIL or BSAI series. Mounting options for this ISO 15552 interchangeable profile cylinder include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX135-20S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N of push force at 0.9 MPa.
The rear adjusting screw acts as an external stopper that lets you shorten the 135 mm nominal stroke by up to 20 mm, providing a usable travel window of 115-135 mm. This allows fine-tuning of the end position at commissioning without replacing the cylinder.
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