Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20S
The AirTAC SAIJ125X425-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 405 to 425 mm. It delivers robust thrust, providing 6136 N push force and 5734 N pull force at 0.5 MPa. This model includes a SUS420J2 stainless steel rod and a built-in magnet for position sensing.
Because the stroke exceeds 300 mm, the 32 mm rod diameter and M27x2 rod thread provide substantial rigidity, yet an external guide remains highly recommended to manage side loads on long extensions. The rear adjuster acts purely as a travel stop for end-position tuning and relies on the variable air cushion for deceleration; it does not lock the load without live air pressure. For secure load-holding without compressed air, an external rod lock or a SAIL cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-20S Is Used
Product Changeover
Dial in the 20 mm stroke adjustment during line format changes to accommodate varying package lengths without replacing the actuator.
End-Stop Tuning
Fine-tune the exact retracted position during machine commissioning to perfect pressing or clamping depth on the assembly line.
Heavy Assembly Press
Leverage the 6136 N thrust at 0.5 MPa for heavy-duty joining operations, using the rear stopper to set precise travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore falls short of the 2513 N push force at 0.5 MPa, but a 160 mm bore would be excessive. The adjustable stroke is ideal for machine setups requiring precise end-position tuning during commissioning or product changeover, avoiding the need to swap out a fixed-stroke SAI cylinder or bolt on external stops. The operating speed is rated for 30-500 mm/s.
As an ISO 15552 dimensionally interchangeable cylinder, replacement matching requires a 125 mm bore, 425 mm nominal stroke, 20 mm adjustment range, PT tapered port threads, and the -S magnet option for CMSE reed or DMSE solid-state sensors. Available mountings include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX425-20S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. The maximum push force reaches 11045 N at 0.9 MPa.
The rear external adjuster allows you to shorten the 425 mm nominal stroke by up to 20 mm, creating a 405 to 425 mm usable travel window. This stopper only sets the end position and does not hold the load without live air pressure.
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