Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50
The AirTAC SAIJ125X850-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates an 800-850 mm usable travel window from the 850 mm nominal stroke. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning. The extruded aluminum barrel includes sensor grooves on both sides, and this specific configuration features a SUS420J2 stainless steel rod for enhanced corrosion resistance alongside PT tapered port threads.
The integrated rear stopper allows fine-tuning of the end position during commissioning without adding external stops or swapping the cylinder. Operating at 30-500 mm/s, it relies on variable air cushions at both ends to decelerate the load. The rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125AX850-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125AX850-50 Is Used
Product Changeover
Dial in the 50 mm travel window to accommodate varying package lengths on a packaging line without physically remounting the actuator.
Machine Setup
Fine-tune the retract end position during initial commissioning to hit exact datum points on heavy machinery.
Variable End Stops
Adjust the effective stroke dynamically to align heavy materials or pallets at different resting depths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore falls short of the required thrust, offering a step up from the 100 mm bore's 3927 N push force at 0.5 MPa to a robust 6136 N. The 50 mm adjustment range is ideal for product-size changeovers on a line, letting operators dial in the exact end-stop on the fly. For load-holding without continuous air pressure, this cylinder is insufficient; the rear adjuster is a stop, not a lock, so you would need to specify an SAIL or BSAI series cylinder instead.
Because the 850 mm stroke exceeds 300 mm, the 32 mm diameter rod will experience amplified side-loading forces. An external guide rail is strongly recommended to prevent rod binding and premature seal wear. This SKU is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX850-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can output up to 1251 kgf.
The rear adjusting screw acts as a mechanical stopper that allows you to trim the effective travel back by up to 50 mm, creating an 800 to 850 mm usable stroke window. It sets the end position but does not lock the load without live air pressure.
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