Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30S
The AirTAC SAIJ125X400-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 370 to 400 mm. It delivers 6136 N of push thrust at 0.5 MPa, making it well-suited for moving heavy loads on large machinery. The extruded aluminum barrel features sensor grooves on both sides, and because this unit includes a magnet, it directly supports CMSE reed and DMSE electronic solid-state switches for precise end-of-stroke detection.
This model uses a carbon steel piston rod with an M27x2 thread, paired with PT tapered port threading and a G1/2 air connection. The rear stopper mechanism allows you to dial back the stroke by up to 30 mm during commissioning without physically swapping the cylinder or adding external stops. It operates at speeds of 30-500 mm/s and incorporates adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-30S Is Used
Product Changeover
Dial in the exact end-stop for varying part lengths on a machining line without swapping out the entire actuator assembly.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to push heavy pallets or transfer large automotive components securely.
Press Fit Tuning
Fine-tune the 370-400 mm travel window during setup to achieve precise insertion depths for large bearing assemblies.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) is insufficient, but you want to avoid stepping up to a massive 160 mm body. The 30 mm adjustment range is ideal for production lines that require variable end-stops for different product sizes, giving you flexibility that a fixed-stroke SAI cylinder cannot provide. For any new build, remember that the rear adjuster acts only as a travel stop to set the deceleration point; it does not hold the load without live air. If your application requires true fail-safe load holding without pneumatic pressure, use an SAIL air-released lock or a BSAI clamp-lock cylinder instead.
Because the 400 mm stroke is substantial, the M27x2 carbon steel rod will experience deflection under high side loads. Always pair this actuator with an external linear guide to prevent binding and premature seal wear. As a dimensionally interchangeable ISO 15552 cylinder, it drops into standard mounting footprints using the Basic, FA, LB, TC, FTC, TCM1, or TCM2 accessory set.
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 SAIJ125X400-30S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The external rear adjuster screw allows you to shorten the 400 mm nominal stroke by up to 30 mm, creating a 370-400 mm usable travel window. This lets you fine-tune the end position at commissioning without adding external stops.
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