Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100S 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 SAIJ125X850-100S
The AirTAC SAIJ125X850-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 850 mm stroke that can be fine-tuned backward by up to 100 mm, yielding a precise 750-850 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore actuator handles heavy-duty positioning. The integrated -S magnet enables position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches.
Because the rear stopper sets the retract end position, you can dial in the exact travel limit during commissioning without adding external physical stops. The extruded aluminum barrel features sensor grooves on both sides, and the carbon steel piston rod utilizes an M27x2 thread. Note that the adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100S |
|---|---|
| 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 SAIJ125X850-100S
| 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 SAIJ125X850-100S Is Used
Variable End Stops
Dial in the retract position within the 750-850 mm window during machine setup to accommodate different product lengths without swapping actuators.
Heavy Assembly Presses
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear stopper to prevent over-travel on the final stroke.
Product Changeover
Quickly adjust the travel limit by up to 100 mm on packaging lines when switching to larger box sizes, minimizing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100S the Right Cylinder?
Select this 125 mm bore model when an application requires substantial thrust—such as 6136 N push at 0.5 MPa—and a variable end-stop for product changeovers. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N push at 0.5 MPa. Conversely, if you need greater load capacity, a 160 mm bore provides 10053 N. The adjustable stroke is chosen over a fixed SAI cylinder when exact end-position tuning is necessary at commissioning. To replace an ISO 15552 cylinder, match the 125 mm bore, 850 mm stroke, PT tapered port thread, and the -S magnet requirement.
With an 850 mm stroke, the M27x2 carbon steel rod is highly susceptible to side loading. An external guide mechanism must support the load to prevent rod bending and premature seal wear. Furthermore, this SAIJ model does not function as a lock; if the machinery requires load-holding without continuous air pressure, integrate an external rod lock or select an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X850-100S 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as an external stopper that trims the effective travel. For this model, the 850 mm nominal stroke can be shortened by up to 100 mm, providing a usable travel window of 750 to 850 mm. It is a travel stop, not a lock, and cannot hold a load without air pressure.
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