Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75S
The AirTAC SAIJ125X225-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 150 to 225 mm, letting you dial back the nominal 225 mm stroke by up to 75 mm. This built-in adjustability allows for precise end-position tuning during commissioning without swapping out the physical cylinder.
Equipped with a -S magnet, the extruded aluminum barrel integrates sensor grooves on both sides for direct mounting of CMSE reed or DMSE solid-state switches. The robust 32 mm carbon steel rod and M27x2 thread handle high side loads, while the standard PT tapered port and 40 mm cushion ensure controlled deceleration at both travel ends.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125X225-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SAIJ125X225-75S Is Used
Variable End-Stop Machining
Dial in the exact clamping depth on machining fixtures by adjusting the rear stopper by up to 75 mm, accommodating different raw material thicknesses without changing the cylinder.
Product Changeover Lines
Rapidly reconfigure packaging or assembly lines for new product sizes by fine-tuning the 150-225 mm travel window at the machine HMI or control panel during setup.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to shift heavy pallets or chassis components, using the adjustable stroke to absorb minor variations in conveyor feed positions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75S the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm option steps the thrust up significantly from 3927N to 6136N at 0.5 MPa, which is critical when moving heavier fixtures. The 75 mm adjustment range is highly beneficial on production lines that require frequent product-size changeovers, acting as a variable end-stop that eliminates the need to bolt on external physical stops. To match this ISO 15552 cylinder for a replacement, verify the 225 mm stroke, 75 mm adjuster, PT G1/2 port, and the -S magnet requirement.
Because the nominal stroke is 225 mm, the load remains well-supported by the 32 mm rod, but any future application scaling beyond 300 mm would require an external guide to prevent excessive side-loading. Remember that the rear adjuster functions purely as a travel stop, not a lock; if the application must hold a load without live air pressure, you must use a SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock instead.
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 SAIJ125X225-75S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590N.
The rear adjusting screw acts as an external stopper, allowing you to shorten the effective travel from the nominal 225 mm down to as little as 150 mm. This provides a 150-225 mm usable window for fine-tuning the end position at commissioning without replacing the cylinder.
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