Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40S
The AirTAC SAIJ125X325-40-S is a double-acting, adjustable-stroke ISO 15552 profile cylinder. It features a 325 mm nominal stroke with a rear mechanical stopper that allows you to trim the effective travel back by up to 40 mm, creating a precise 285-325 mm usable window for fine-tuning end positions at commissioning. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy loads and is equipped with a SUS420J2 stainless steel rod for enhanced corrosion resistance.
This model includes a magnetic piston (-S) for position sensing with AirTAC CMSE reed or DMSE solid-state switches, which seat directly into the extruded aluminum barrel's dual sensor grooves. The rear adjuster acts purely as a travel stop to decelerate the load and set the retract end, not as a lock, so live air pressure is required to hold the load. It uses PT tapered ports and operates at speeds of 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125AX325-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125AX325-40S Is Used
Machine Changeover
Dial in the 285-325 mm retract position during product size transitions without physically swapping cylinders or repositioning hard stops.
Variable End Stops
Use the 40 mm rear adjuster to set precise deceleration endpoints for heavy actuators requiring strict positional tuning at commissioning.
Heavy Assembly Lines
Leverage the 6136 N pull force and SUS420J2 rod to drive robust pressing and lifting stations safely in demanding industrial environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2268 N pull at 0.5 MPa) is insufficient for your load, but stepping up to a 160 mm bore (9425 N pull) would be excessive. The 40 mm adjustment range is highly valuable for machine setups requiring variable end stops or product changeovers, allowing you to dial in the exact retract position without swapping the cylinder or adding external stops. Because the nominal 325 mm stroke exceeds 300 mm, an external guide is recommended to prevent excessive side-load on the 32 mm rod.
For a direct ISO 15552 replacement, match the 125 mm bore, 325 mm stroke, 40 mm adjustment, PT port thread, and -S magnet. Note that SAIJ supports a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If your application requires true load-holding without continuous air pressure, select the SAIL (air-released lock) or BSAI (clamp-lock) series instead of relying on this rear stopper.
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 SAIJ125AX325-40S FAQ
At 0.5 MPa, it provides 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, the push force reaches 11045 N.
The rear adjuster screw lets you shorten the 325 mm nominal stroke by up to 40 mm, yielding a usable travel window of 285-325 mm. It functions as a mechanical stop to tune the end position, not as a lock to hold the load without air.
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