Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-100 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 SAIJ125AX900-100
The AirTAC SAIJ125X900-100 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty positioning, delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa. Its defining characteristic is the integrated rear stroke adjuster, which permits a usable travel window of 800-900 mm. Rather than fabricating custom stops or swapping out the entire barrel when a production line shifts parameters, operators can dial the external screw to trim the nominal 900 mm stroke back by up to 100 mm during commissioning.
This 125 mm bore unit features a 32 mm SUS420J2 stainless steel rod and PT tapered G1/2 ports. The extruded aluminum barrel incorporates sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. It supports a speed range of 30-500 mm/s and utilizes variable air cushions at both ends to manage kinetic energy. The rear adjuster functions strictly as a mechanical stop for end-position tuning; it does not lock the load or hold position without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-100 |
|---|---|
| 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 SAIJ125AX900-100
| 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 SAIJ125AX900-100 Is Used
Product Changeover Systems
Dial the stroke back by up to 100 mm to quickly adapt a conveyor end-stop for different package sizes without changing the cylinder.
Heavy Assembly Presses
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the 800-900 mm travel window to fine-tune the pressing depth.
Long-Stroke Material Handling
Move heavy pallets over a 900 mm travel distance, relying on the variable air cushions to safely decelerate the substantial load at the ends.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-100 the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm variant doubles the available thrust, jumping from 3927 N to 6136 N at 0.5 MPa, which is essential for moving substantial masses. An adjustable stroke is chosen over a fixed SAI cylinder when a machine requires frequent product-size changeovers, allowing the end-stop to be fine-tuned on the floor without adding external stopper blocks. For any stroke length of 900 mm, the long unsupported piston rod is highly susceptible to side-loading and buckling, making an external linear guide strictly necessary to prevent premature seal failure.
If the application demands true load-holding in the event of air loss, this standard SAIJ cylinder is insufficient because the rear adjuster only sets the travel end. You must pivot to an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder, or install an external pilot-operated check valve. To replace an ISO 15552 cylinder with this unit, verify the 125 mm bore, 900 mm stroke, 100 mm adjustment range, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), noting that FB, CA, CB, and CR mounts are omitted from this adjustable family.
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 SAIJ125AX900-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. The maximum operating speed is 30-500 mm/s.
The rear adjuster acts as an external mechanical stop that allows you to shorten the effective travel from the nominal 900 mm down to as little as 800 mm. This provides a 100 mm tuning window for setting precise end positions without replacing the cylinder.
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