Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100 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 SAIJ125X850-100
The AirTAC SAIJ125X850-100 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, providing robust actuation for heavy industrial loads. The extruded aluminum barrel features sensor grooves on both sides for straightforward position detection.
This specific SKU provides a nominal 850 mm stroke that can be dialed back by up to 100 mm, creating a precise 750-850 mm usable travel window. This built-in mechanical stopper allows you to fine-tune the retract end position during commissioning without swapping out the entire cylinder. The standard carbon steel rod and PT tapered port threads ship as configured, matching the demanding requirements of high-force pneumatic setups.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100 |
|---|---|
| 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 SAIJ125X850-100
| 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 SAIJ125X850-100 Is Used
Variable End-Stop Forming
Dial in the exact 750-850 mm retract position for metal forming or bending presses, accommodating different material lengths without changing the cylinder setup.
Product Changeover Diverters
Quickly adjust the stroke by up to 100 mm during production line changeovers to handle varying package sizes on heavy-duty material handling conveyors.
Heavy Fixture Clamping
Leverage the 6136 N push force at 0.5 MPa to secure large workpieces, using the rear stopper to fine-tune the clamp position based on part geometry.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-100 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires substantial thrust—delivering 6136 N at 0.5 MPa—alongside a highly variable end-stop. If you need less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for product changeovers on a line, letting you set the exact retract distance on the fly instead of relying on a fixed-stroke SAI variant.
Because the 850 mm stroke is substantial, the 32 mm carbon steel rod and M27x2 rod thread will still experience deflection under heavy side loads; an external guide rail is recommended to prevent premature seal wear. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air—for load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI variant. This model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options.
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 SAIJ125X850-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear mechanical adjuster allows you to shorten the 850 mm nominal stroke by up to 100 mm, providing a usable travel window of 750-850 mm. It acts as a physical stop to fine-tune the end position and is not a locking mechanism.
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