Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10 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 SAIJ125AX850-10
The AirTAC SAIJ125X850-10 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N pull force at 0.5 MPa. It features a SUS420J2 stainless steel rod and PT tapered ports. The built-in stopper allows you to fine-tune the effective travel window down to 840-850 mm without swapping out the entire unit.
Because the 850 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread provide necessary rigidity, though an external guide is still recommended to handle side loads. This adjustable model uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10 |
|---|---|
| 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 SAIJ125AX850-10
| 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 SAIJ125AX850-10 Is Used
Precision End-Stop Tuning
Dial in the exact 840-850 mm end position during machine commissioning to achieve precise clamping without adding external mechanical stops.
Product Changeover
Quickly adjust the rear stopper by up to 10 mm to accommodate slightly different product lengths on an automated packaging line.
Heavy-Duty Positioning
Leverage the 6136N pull force to shift heavy pallets or fixtures, using the fine adjustment to perfect the resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10 the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm cylinder lacks thrust, as stepping up provides 6136N pull force compared to 3681N. The 10 mm adjustment range is ideal for dialing in exact end positions during machine commissioning or product changeovers, avoiding the need to bolt on external stops. If you step down to an 80 mm bore, you drop to 2268N pull force.
For an 850 mm stroke, supporting the rod against side loading is critical to prevent premature seal wear. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder. To match this ISO 15552 footprint, specify the 125 mm bore, 850 mm stroke, PT ports, and your chosen mounting style.
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 SAIJ125AX850-10 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of pull force and 6136N of push force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the 850 mm nominal stroke by up to 10 mm, creating a usable travel window of 840-850 mm. It only sets the end position and does not lock the load without live air pressure.
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