Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-20S 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 SAIJ125X850-20S
The AirTAC SAIJ125X850-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 830 to 850 mm. Delivering a substantial 8590 N of push force at 0.7 MPa, it is designed for heavy-duty positioning. The carbon steel rod features an M27x2 thread, paired with 40 mm air cushions at both ends to manage heavy kinetic energy.
This variant includes a magnetic piston (-S) for position sensing, operating reliably with AirTAC CMSE reed and DMSE electronic solid-state switches housed in the dual-sided sensor grooves. Fluid supply is routed through PT G1/2 ports, and the extruded aluminum barrel design maintains standard ISO 15552 mounting dimensions without relying on external tie-rods.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-20S |
|---|---|
| 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 SAIJ125X850-20S
| 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 SAIJ125X850-20S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance from 830 to 850 mm during machine setup to accommodate varying product lengths without disassembling the pneumatic circuit.
Product Changeover Systems
Quickly fine-tune the stroke end on automated lines handling different material widths, using the rear screw to adapt the motion profile on the fly.
Heavy-Duty Assembly Presses
Leverage the 8590 N push force at 0.7 MPa to drive large components together, relying on the 40 mm cushions to absorb the impact of the 850 mm travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-20S the Right Cylinder?
Choose this 125 mm bore when 80 mm bore thrust (3518 N at 0.7 MPa) is insufficient but stepping up to a 160 mm bore (14074 N) would overcomplicate the machine footprint. The 20 mm rear adjuster allows precise end-position tuning during commissioning or product changeover without swapping the cylinder or adding external stops. Because the 850 mm stroke exceeds 300 mm, an external guide is strongly recommended to prevent excessive side-loading on the M27x2 rod. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder. This unit is dimensionally interchangeable with ISO 15552 cylinders, configured with a PT G1/2 port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mountings, and a magnetic piston.
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 SAIJ125X850-20S FAQ
At 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 7546 N of pull force. It operates at a speed range of 30-500 mm/s, supported by 40 mm adjustable air cushions at both ends.
A rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective travel from the nominal 850 mm down to 830 mm. This provides a 20 mm tuning window for precise end-positioning without replacing the cylinder.
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