Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40 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 SAIJ125AX900-40
The AirTAC SAIJ125X900-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa while providing a usable travel window of 860 to 900 mm. The external stopper allows you to fine-tune the retract end position during commissioning without swapping out the entire cylinder or adding external stops.
This 125mm bore unit integrates a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40 |
|---|---|
| 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 SAIJ125AX900-40
| 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 SAIJ125AX900-40 Is Used
Machine Changeover
Dial in the 860-900mm travel window during product size transitions without physically swapping cylinders or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract stroke precisely at commissioning to absorb mechanical tolerances in large-format automated assembly lines.
Heavy-Duty Forming
Leverage 6136N of thrust at 0.5 MPa for pressing or forming tasks while retaining the flexibility to adjust the stroke end-point as needed.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-40 the Right Cylinder?
Choose this 125mm bore when your application requires higher thrust than the 80mm option (which provides 2513N at 0.5 MPa) but does not necessitate stepping up to the 160mm class. The 40mm adjustment range is ideal for machinery that undergoes frequent product changeovers, allowing operators to dial in the exact end position on the fly. For load-holding requirements without continuous air pressure, this cylinder is not suitable; consider the SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, match the 125mm bore, 900mm nominal stroke, 40mm adjustment, PT port thread, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the stroke is 900mm, the 32mm rod diameter and long unsupported travel demand an external guide to prevent excessive side-loading and premature seal wear.
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 SAIJ125AX900-40 FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. The operational speed range is 30-500 mm/s.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective travel from the 900mm nominal stroke down to 860mm. It sets the end position but does not lock or hold the load without live air pressure.
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