Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40 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 SAIJ125X850-40
The AirTAC SAIJ125X850-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 850 mm stroke with a usable travel window of 810 to 850 mm, allowing you to dial back the retract position by up to 40 mm during commissioning. Delivering 5734 N of pull force at 0.5 MPa, it handles heavy loads with precision. The carbon steel rod and M27x2 thread provide a robust interface for high-thrust applications.
This extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches if a magnet is added later. The rear adjuster acts purely as a mechanical stop to set the end position; it does not lock the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40 |
|---|---|
| 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 SAIJ125X850-40
| 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 SAIJ125X850-40 Is Used
Machine Changeover
Fine-tune the retract distance up to 40 mm when switching product sizes on a heavy-duty conveyor line, avoiding the need to swap out the entire cylinder.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to position heavy materials, using the adjustable end-stop to perfectly time the press stroke.
Variable End-Stop Setup
Set precise end-positions during machine commissioning, using the 810-850 mm travel window to dial in the exact retract point without external shims.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40 the Right Cylinder?
Choose this 125 mm bore when 100 mm (3681 N pull at 0.5 MPa) is insufficient for your heavy-duty positioning. The 40 mm adjustment range is ideal for product changeovers on a line, letting you shift the end-stop without physically swapping the cylinder or adding external stops. The PT tapered port threads match standard pneumatic fittings, and the mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Because the 850 mm stroke is substantial, the 32 mm rod and M27x2 thread will still experience side-loading forces if the load is unsupported. An external guide is strongly recommended to prevent rod binding. If you need fail-safe load holding, use an external rod lock or pilot-operated check valve, as the SAIJ adjuster only decelerates travel.
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 SAIJ125X850-40 FAQ
The rear adjuster screw lets you shorten the effective stroke from 850 mm down to 810 mm. It acts as a mechanical stop to fine-tune the end position, but it is not a lock and will not hold the load without live air pressure.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
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