Airtac SAIJ125 Adjustable Cylinder SAIJ125X190-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X190-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 190mm 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
- Stroke190 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X190-75S
The AirTAC SAIJ125X190-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 190 mm travel by up to 75 mm. This yields a usable end-position window of 115-190 mm, providing exceptional flexibility for product-size changeovers without physically swapping the actuator. In the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa.
This unit features a standard carbon steel piston rod and includes a built-in magnet (-S) for position sensing. You can mount AirTAC CMSE reed or DMSE electronic sensors directly into the extruded aluminum barrel's dual sensor grooves. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, intentionally omitting FB, CA, CB, and CR brackets to streamline changeover setups.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X190-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X190-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 190 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 SAIJ125X190-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×190 | 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 SAIJ125X190-75S Is Used
Variable End-Stop Positioning
Dial the travel back from 190 mm to 115 mm to accommodate different product lengths on a packaging line without changing out the cylinder.
Machine Setup and Changeover
Use the 75 mm adjustment range to fine-tune the retract end-position during commissioning, eliminating the need for external mechanical stops.
Heavy-Duty Forming Stops
Leverage the 1251 kgf maximum push force to securely press or form components, relying on the rear screw to set precise bottoming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X190-75S the Right Cylinder?
Select this 125 mm bore actuator when your application requires heavy thrust—such as 6136 N pull at 0.5 MPa—and highly variable end-stops. If your force requirements are lower, stepping down to a 100 mm bore provides 3681 N pull at 0.5 MPa, halving your air consumption. The integrated rear adjuster is strictly a travel stop for fine-tuning end positions during commissioning; it is not a lock. Because this is a double-acting cylinder, it will not hold a load without live air pressure. For dead-end load holding, consider an external pilot-operated check valve or the related AirTAC SAIL or BSAI clamp-lock series.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 190 mm stroke, 75 mm adjustment range, PT tapered port threads, and the -S magnet requirement. The operating speed for this 125 mm bore is rated for 30-500 mm/s. Because the stroke is under 300 mm, side-load stress is minimal, but you should still ensure the M27x2 rod thread is rigidly coupled to the load to prevent binding.
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 SAIJ125X190-75S FAQ
The rear adjuster acts as an external stopper that shortens the effective stroke by up to 75 mm. This means the 190 mm nominal stroke can be fine-tuned to any travel length between 115 mm and 190 mm without adding external stops.
At a standard 0.5 MPa operating pressure, it provides 6136 N of pull force and 8590 N of push force. At the maximum rated pressure of 1.0 MPa, the push force reaches 1251 kgf.
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