Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40S 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 SAIJ125X900-40S
The AirTAC SAIJ125X900-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N push force at 0.5 MPa. It features a carbon steel piston rod and a PT tapered port. Because of the 40mm adjustment code, this 900mm nominal stroke model yields an effective travel window of 860-900mm, allowing you to dial in the exact retract end-position during commissioning without adding external stops.
The integrated magnet (-S) supports AirTAC CMSE reed and DMSE electronic sensors, which mount cleanly into the dual sensor grooves on the extruded aluminum barrel. It reaches speeds of 30-500mm/s and uses the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40S |
|---|---|
| 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 SAIJ125X900-40S
| 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 SAIJ125X900-40S Is Used
Machine Changeover
Dial in the 860-900mm retract position precisely when switching machinery between different product sizes without swapping cylinders.
Long-Stroke Diverting
Provides robust 6136N thrust at 0.5 MPa for moving heavy pallets on a conveyor, with fine-tuning to accommodate varying pallet depths.
End-Stop Calibration
Eliminates the need for external mechanical shims by using the built-in 40mm rear adjuster to set the exact end-of-stroke deceleration point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-40S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be physically oversized. The adjustable stroke is perfect for product-size changeovers on a line, whereas a fixed SAI cylinder would require physical shimming. For this 900mm stroke, the 32mm rod and M27x2 thread handle high stresses, but an external guide is strongly recommended to prevent excessive side-loading on the long unsupported travel.
Remember that the rear adjuster acts as a travel stop, not a lock; the SAIJ125X900-40-S cannot hold a load without live air. For pilot-operated load holding, consider the SAIL or BSAI series. To replace an ISO 15552 cylinder, match the 125mm bore, 900mm stroke, PT port, and mounting hardware.
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 SAIJ125X900-40S 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 adjusting screw acts as a mechanical stop that shortens the effective retract stroke. For this 900mm nominal stroke model, you can trim the travel back by up to 40mm, creating an 860-900mm usable window. Note that this is a stop, not a lock, and the cylinder requires live air to hold position.
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