Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75S
The AirTAC SAIJ125X900-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 900 mm stroke that can be fine-tuned backward by up to 75 mm, yielding an effective 825-900 mm travel window. In the 125 mm bore class, it generates 6136 N of push force at 0.5 MPa and up to 11045 N at 0.9 MPa, making it suitable for heavy-duty positioning tasks.
This variant includes a standard carbon steel piston rod and a -S magnet for position sensing using CMSE reed or DMSE electronic switches. The extruded aluminum barrel features sensor grooves on both sides. Because the 900 mm stroke is substantial, the 32 mm rod and M27x2 thread provide robust support, though an external guide is still recommended for heavy unsupported loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-75S Is Used
Heavy Press Positioning
Dial in the exact 825-900 mm end-stop during heavy press setup, allowing flexible product changeover without replacing the actuator.
Variable End-Stop Tuning
Fine-tune the retract position by up to 75 mm at commissioning to compensate for mechanical wear or sensor drift on the line.
Large Assembly Line Indexing
Move substantial jigs using up to 11045 N of thrust at 0.9 MPa, relying on the 32 mm rod to handle high side loads during transit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (delivering 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N at 0.5 MPa) would be excessive overkill. The 75 mm rear adjuster allows you to dial in the exact retract end-position during commissioning or product changeover without swapping the cylinder or adding external mechanical stops. Fluid must be filtered air, operating pressure is 0.15-1.0 MPa, and the PT tapered port is G1/2.
For ISO 15552 dimensional interchangeability, match the 125 mm bore, 900 mm stroke, PT G1/2 port, and the -S magnet option. Note that the rear adjuster acts only as a travel stop and relies on the variable air cushion for end-deceleration; it does not hold the load without live air. For load-holding without continuous pressure, consider the SAIL or BSAI cylinder series. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X900-75S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw shortens the effective stroke by up to 75 mm, creating a usable travel window of 825-900 mm. It functions as a stop and does not lock the load without live air pressure.
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