Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40S
The AirTAC SAIJ125X40-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 40 mm nominal travel that can be dialed back by up to 40 mm, giving you a 0-40 mm usable window to perfectly tune the retract end-position during commissioning. Equipped with a -S magnet, it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state sensors mounted in the dual-side extruded barrel grooves.
Delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa, this bore size handles heavy loads. The 32 mm carbon steel rod and M27x2 thread provide a robust interface for high-thrust tasks. The rear adjuster acts purely as a mechanical stop to set the travel end and relies on the integrated air cushions for deceleration; it is not a locking device and will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-40S Is Used
Machine Changeover
Dial in the exact 0-40 mm retract position during product size changes without swapping the cylinder or adding external mechanical stops.
Heavy Clamping Stops
Leverage 6136 N of thrust to secure heavy workpieces while fine-tuning the clamping depth via the rear adjustment screw.
Sensor-Driven Positioning
Utilize the built-in -S magnet with CMSE and DMSE sensors to confirm end-of-stroke travel across the adjusted 0-40 mm window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40S the Right Cylinder?
Choose this 125 mm bore adjustable model when your machine setup requires variable end-stops or frequent product changeovers rather than a fixed-stroke SAI cylinder. If your application demands less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. For higher force requirements, moving up to a 160 mm bore provides 10053 N. Because this cylinder uses a PT tapered port thread and a carbon steel rod, you should match your fittings and load couplings accordingly.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 40 mm stroke, 40 mm adjustment range, PT G1/2 port, and the required mounting accessory from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this series omits FB, CA, CB, and CR mounts. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
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 SAIJ125X40-40S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you trim the 40 mm nominal stroke back by up to 40 mm, creating a 0-40 mm usable travel window. It sets the end position and works with the air cushions for deceleration, but it does not lock or hold the load without live air pressure.
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