Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40S
The AirTAC SAIJ125X300-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of pull force at 0.5 MPa and provides a usable travel window of 260-300mm, allowing you to trim up to 40mm from the nominal stroke during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and this specific configuration includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors.
This model uses a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and features PT tapered port threads (G1/2). The rear adjustment screw functions purely as a mechanical stop to set the retract end-position; it does not lock or hold the load without continuous air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-40S Is Used
Product Changeover
Dial in the 260-300mm travel window during format size changes on packaging lines without physically swapping out the actuator.
End-Stop Tuning
Use the rear mechanical stop to precisely set the retract position for machining fixtures during initial machine commissioning.
Heavy Material Handling
Leverage the 6136N pull force to push or position heavy pallets, using the 40mm adjustment to fine-tune the resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-40S the Right Cylinder?
Select this 125mm bore cylinder when a 100mm bore (offering 528N pull at 0.5 MPa) lacks the force to move your payload, but a 160mm bore is physically too large. The adjustable 260-300mm travel window is ideal for product-size changeovers on a line, allowing operators to fine-tune the end stop without swapping out the cylinder or adding external shims. When replacing an ISO 15552 cylinder, match the 125mm bore, 300mm stroke, 40mm adjustment, PT G1/2 port, and -S magnet requirement.
Because this model has a 300mm stroke, the 32mm diameter piston rod will experience increased leverage on the front bearing under offset loads. For strokes of 300mm or more, always use an external guide rail to prevent side-load wear and premature seal failure. The SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on some other profiles.
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 SAIJ125AX300-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 1559N of push force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
The rear adjuster screw allows you to mechanically shorten the stroke by up to 40mm, creating a usable travel window of 260-300mm. This stopper only sets the end position; it does not act as a lock to hold the load without air pressure.
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