Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20
The AirTAC SAIJ125X240-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a 32mm carbon steel piston rod with an M27x2 thread and PT tapered ports. By integrating an external adjusting screw, this cylinder allows you to fine-tune the retract end position, creating a usable travel window between 220 and 240mm without swapping out hardware.
This adjuster acts purely as a mechanical stop to set the travel end and relies on the standard variable air cushions for deceleration; it does not hold the load without live air. For load-holding without pneumatic pressure, a related type like the SAIL or BSAI is required. The extruded aluminum barrel includes sensor grooves on both sides, and adding a magnet (-S) enables tracking with CMSE reed or DMSE electronic sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-20 Is Used
Product Changeover
Dial in the 220-240mm travel window during format changes on packaging lines, using the rear screw to adapt the stroke to new carton sizes instantly.
Machine Setup
Achieve precise end-position calibration during initial commissioning without machining external stopper blocks or altering the ISO 15552 mounting footprint.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or workpieces, relying on the robust 32mm carbon steel rod to withstand demanding industrial loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-20 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires substantial force—such as the 6136N push or 5734N pull at 0.5 MPa—but demands exact end-position tuning during commissioning or product changeover. If your setup needs less force, stepping down to a 100mm bore yields 3927N push force, whereas moving up to a 160mm bore provides 10053N. Because the nominal stroke is 240mm, an external guide is recommended to manage side loads and prevent excessive wear on the rod seals.
The adjustable stroke is chosen over a fixed SAI cylinder when machine setups involve variable end-stops or slight product size changes, saving the cost of stocking multiple fixed-length cylinders. When matching this ISO 15552 dimensionally interchangeable cylinder, verify the 240mm stroke, 20mm adjustment range, PT port threads, and your required mounting set. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options.
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 SAIJ125X240-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
The rear adjusting screw acts as a mechanical stopper that lets you shorten the effective travel from the 240mm nominal stroke down to 220mm. This creates a 220-240mm adjustable window for fine-tuning the end position at commissioning, but it does not lock the load without live air pressure.
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