Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75S 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 SAIJ125X850-75S
The AirTAC SAIJ125X850-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to fine-tune the retract end position during commissioning. With a nominal 850 mm stroke and a 75 mm adjustment range, it provides a usable travel window of 775 to 850 mm, allowing precise variable end-stops without swapping out the cylinder or adding external stops. It delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning.
This variant includes a standard magnet for position sensing via AirTAC CMSE reed or DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides, and the unit omits FB, CA, CB, and CR mounts, utilizing a focused mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The standard carbon steel rod and PT tapered port thread ensure durable, high-flow pneumatic connections.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75S |
|---|---|
| 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 SAIJ125X850-75S
| 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 SAIJ125X850-75S Is Used
Variable End-Stop Machining
Dial in the exact 775 to 850 mm retract position for multi-part machining lines without physically swapping cylinders or repositioning hard stops.
Product Size Changeover
Quickly adapt long-stroke pneumatic pushers on packaging conveyors to accommodate different carton lengths by adjusting the rear stopper.
Commissioning Fine-Tuning
Perfect the end-of-stroke position during machine setup, using the 75 mm adjustment window to compensate for mechanical tolerance stack-up.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-75S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust, such as the 6136 N pull force at 0.5 MPa, but you need the flexibility to dial in the exact retract distance within a 775 to 850 mm window. If your force requirements are lower, stepping down to an 80 mm bore yields 2268 N of pull force, while stepping up to a 160 mm bore provides 9425 N. Because the stroke is 850 mm, the long unsupported piston rod is susceptible to side-loading; always use an external guide to prevent premature seal wear.
The rear adjuster acts strictly as a mechanical stop to tune the travel end and deceleration, meaning it will not hold the load if air pressure drops. For secure load-holding without live air, consider an AirTAC SAIL (air-released lock) or BSAI (clamp-lock) cylinder. This model is dimensionally interchangeable per ISO 15552, featuring a 125 mm bore, 850 mm stroke, 75 mm adjustment, PT port thread, and a -S magnet.
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 SAIJ125X850-75S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 75 mm. This creates a usable travel window of 775 to 850 mm, allowing you to set the exact retract end-position without adding external stops.
At 0.5 MPa, it provides 6136 N of pull force and 6136 N of push force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
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Standard models usually ship in 3-4 days.
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