Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50
The AirTAC SAIJ125X350-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 350 mm nominal stroke that can be dialed back by up to 50 mm, creating a precise 300-350 mm usable travel window for commissioning flexibility. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for moving heavy industrial loads.
This variant features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides, and because no magnet is specified, you can add one later to utilize CMSE reed or DMSE electronic sensors. The rear adjustment screw acts strictly as a travel stop to set the end position, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-50 Is Used
Product Changeover
Dial in the 300-350 mm travel window during format changes without swapping out the entire cylinder or reengineering fixed stops.
Heavy Pressing
Leverage 6136 N of push force at 0.5 MPa for heavy-duty pressing and forming operations requiring precise end-position tuning.
Automated Assembly
Integrate the ISO 15552 mounting footprint into large-scale automated lines, using the rear stopper to fine-tune the final stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—6136 N at 0.5 MPa or 8590 N at 0.7 MPa. If your process demands less force, stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N, whereas moving up to a 160 mm bore increases it to 10053 N. The adjustable 300-350 mm travel window is ideal for machines that undergo frequent product-size changeovers, eliminating the need to physically swap cylinders or add external mechanical stops.
For an exact ISO 15552 dimensional replacement, match the 125 mm bore, 350 mm stroke, 50 mm adjustment range, PT tapered port threads, and the SUS420J2 rod material. Note that SAIJ uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. Because the 350 mm stroke is relatively long for this bore size, ensure adequate external guidance to prevent rod side-loading, as the 32 mm rod can only absorb limited lateral stress. If the machine must hold a load statically without live air pressure, use an external rod lock or select an AirTAC SAIL or BSAI cylinder 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 SAIJ125AX350-50 FAQ
At 0.5 MPa operating pressure, the 125 mm bore generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 350 mm nominal stroke by up to 50 mm, providing a usable travel window of 300-350 mm. It only sets the end position and does not lock or hold the load without continuous air pressure.
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