Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50S 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 SAIJ125AX850-50S
The AirTAC SAIJ125X850-50-S is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a usable travel window of 800-850 mm, allowing you to dial back the 850 mm nominal stroke by up to 50 mm during machine commissioning. In the 125 mm bore class, it outputs 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This variant includes a SUS420J2 stainless steel rod for improved corrosion resistance and a magnet for position sensing. The extruded aluminum barrel features sensor grooves on both sides, accepting AirTAC CMSE reed switches or DMSE solid-state sensors. It uses PT tapered port threads and offers a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50S |
|---|---|
| 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 SAIJ125AX850-50S
| 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 SAIJ125AX850-50S Is Used
Product Changeover Systems
Dial in the 800-850 mm travel window on the fly to accommodate different product lengths on a packaging line without swapping out the entire actuator.
Heavy Press Positioning
Leverage 6136 N of push force at 0.5 MPa to move heavy pallets, using the rear stopper to fine-tune the final clamping position during setup.
Long-Stroke Assembly Lines
Utilize the 850 mm travel for large-format component placement, relying on the built-in magnet and DMSE solid-state sensors for precise end-of-travel confirmation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-50S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires high thrust combined with variable end-stop positioning. If your process needs slightly less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa. Choose the SAIJ adjustable-stroke design over a fixed-stroke SAI when you need precise end-position tuning for product changeovers without adding external stops. For strokes of 850 mm, an external guide mechanism is highly recommended to prevent excessive side-loading on the 32 mm rod.
Because the rear adjuster acts only as a travel stop and the air cushions provide deceleration, this cylinder will not hold a load without live air pressure. For fail-safe load holding, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock series. To match this ISO 15552 footprint, specify the 125 mm bore, 850 mm stroke, 50 mm adjustment range, PT ports, and the -S magnet option.
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 SAIJ125AX850-50S 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 operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjusting screw allows you to mechanically shorten the effective travel from the nominal 850 mm down to 800 mm. This creates an 800-850 mm usable window for fine-tuning end positions at commissioning, but it functions only as a stop and does not lock the load without continuous air pressure.
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