Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40
The AirTAC SAIJ125X900-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 860-900 mm usable travel window, allowing you to dial back the 900 mm nominal stroke by up to 40 mm during commissioning. Belonging to the 125 mm bore class, it delivers a robust 6136 N pull force at 0.5 MPa and up to 11045 N push at 0.9 MPa.
This extruded aluminum barrel design incorporates variable air cushions at both ends (40 mm cushion length) to manage kinetic energy. The 32 mm carbon steel rod and M27x2 thread provide high structural integrity for heavy loads. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, giving you flexibility without the need for external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-40 Is Used
Product Changeover
Dial in the exact 860-900 mm end position for different product lengths on a packaging line without physically swapping cylinders or adding external stopper blocks.
Heavy Press Tuning
Leverage the 11045 N push force at 0.9 MPa for heavy pressing operations while fine-tuning the exact bottoming position during machine setup.
Long-Stroke Material Handling
Use the 900 mm travel to push heavy pallets or workpieces, adjusting the stroke by up to 40 mm to accommodate varying load sizes on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40 the Right Cylinder?
Choose this 125 mm bore when your application requires significantly more force than a 100 mm cylinder (which provides 3681 N pull at 0.5 MPa) but less than the massive 160 mm class (9425 N pull). The adjustable stroke is ideal for production lines needing variable end-stops or product-size changeovers, offering fine-tuning without swapping the cylinder. Because the stroke is 900 mm, an external guide is recommended to prevent excessive side-loading on the rod.
The rear adjuster acts solely as a travel stop and does not hold the load without live air pressure. For load-holding without continuous air, consider the SAIL or BSAI series. This SAIJ model uses a PT tapered port thread, a standard carbon steel rod, and no sensor magnet. It is dimensionally interchangeable per ISO 15552 with equivalent profile cylinders.
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 SAIJ125X900-40 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 40 mm, providing a usable travel window of 860-900 mm. It acts as a mechanical stop to fine-tune the end position at commissioning without replacing the cylinder.
At 0.5 MPa, it provides 6136 N push and 5734 N pull force. At 0.9 MPa, the push force increases to 11045 N, making it suitable for heavy-duty applications.
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