Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20 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 SAIJ125X900-20
The AirTAC SAIJ125X900-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a carbon steel piston rod and PT tapered ports. The integrated rear stopper allows you to fine-tune the effective travel within an 880-900mm window, providing precise end-position control without requiring external physical stops.
This adjustable-stroke design is ideal for high-force applications needing variable endpoints during product changeovers. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. While the rear screw sets the travel limit and the variable air cushions decelerate the load, neither component acts as a lock to hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20 |
|---|---|
| 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 SAIJ125X900-20
| 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 SAIJ125X900-20 Is Used
Product Changeovers
Dial in the 880-900mm travel window during line changeovers to accommodate slightly different product lengths without swapping out the entire actuator.
Heavy Machinery Setup
Leverage the 6136N push force at 0.5 MPa for heavy pressing or lifting operations, using the rear stopper to precisely set the final end position.
Commissioning Calibration
Fine-tune the machine cycle at startup by adjusting the rear screw up to 20mm, ensuring perfect alignment without adding bulky external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20 the Right Cylinder?
Choose this 125mm bore cylinder when a smaller 100mm bore (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but stepping up to a 160mm bore is unnecessary. The 20mm adjustment range is selected over a fixed-stroke SAI cylinder when a machine requires minor endpoint tuning at commissioning to accommodate slight product size variations. To replace an ISO 15552 cylinder, match the 900mm stroke, 20mm adjustment, PT port thread, and mounting style. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options.
Because the 900mm stroke is substantial, the 32mm carbon steel rod and M27x2 thread will still require an external guide to prevent excessive side-loading on the piston. For load-holding without continuous air pressure, a plain SAIJ is insufficient; consider an AirTAC SAIL or BSAI locking 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 SAIJ125X900-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 900mm stroke by up to 20mm. This creates a usable travel window of 880-900mm for fine-tuning the retract end position without replacing the cylinder.
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