Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75 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 SAIJ125AX850-75
The AirTAC SAIJ125X850-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a substantial 6136N pull force at 0.5 MPa, utilizing a 32mm SUS420J2 stainless steel rod. The integrated rear stopper allows you to trim the nominal 850mm travel down by up to 75mm, creating a precise 775-850mm usable window for exact end-position tuning at commissioning.
This heavy-duty actuator features a PT tapered G1/2 port and variable air cushions at both ends to decelerate large moving masses. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. Because the adjuster acts purely as a mechanical stop, it cannot hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75 |
|---|---|
| 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 SAIJ125AX850-75
| 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 SAIJ125AX850-75 Is Used
Heavy-Duty Product Changeover
Adjusts the retract end-position by up to 75mm to quickly accommodate different large product sizes on the same conveyor line without changing cylinders.
Long-Stroke Press Feeding
Handles substantial 6136N pull forces to feed heavy materials into a press, using the rear stopper to fine-tune the material push depth during setup.
Variable End-Stop Positioning
Provides a 775-850mm travel window for automated assembly stations that require precise tweaking of the final retract position without external stopper hardware.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-75 the Right Cylinder?
Selecting this 125mm bore is appropriate when your process requires shifting heavy payloads that exceed the 3927N push force of a 100mm cylinder, but do not yet demand the 10053N output of a 160mm unit. The 75mm adjustment range is highly valuable on long-stroke machinery where you need to dial in the exact end-stop during product changeovers without physically swapping the cylinder or adding external stops. To achieve a drop-in ISO 15552 replacement, match the 850mm stroke, 75mm adjuster, PT G1/2 port, Basic/LB/TC mounting, and standard non-magnet configuration.
At 850mm of travel, the unsupported 32mm rod is susceptible to deflection and side-loading under high lateral forces. An external guide rail is strongly recommended to prevent premature seal wear and binding. Furthermore, remember that neither the rear adjuster nor the air cushions function as a lock; if the air supply drops, the load will move.
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 SAIJ125AX850-75 FAQ
A rear external adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke from 850mm down to a minimum of 775mm. This provides a 75mm tuning window for precise end-position setup, but it does not lock the load in place without continuous air pressure.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. The operational speed range for this 125mm bore is 30-500 mm/s, making it suitable for moving heavy loads at controlled, moderate velocities.
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