Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-75 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 SAIJ125AX225-75
The AirTAC SAIJ125X225-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a generous 150-225 mm usable travel window, allowing you to dial back the 225 mm nominal stroke by up to 75 mm during commissioning without swapping out the unit. Delivering 6136 N of pull force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This variant uses a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance compared to standard carbon steel. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic solid-state switches. It supports a speed range of 30-500 mm/s and uses PT tapered port threads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-75 |
|---|---|
| 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 SAIJ125AX225-75
| 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 SAIJ125AX225-75 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 150 and 225 mm for multi-part machining operations without changing the cylinder.
Product Changeover
Quickly adapt the stroke window on automated assembly lines when switching between different product sizes or formats.
Machine Setup Tuning
Fine-tune the final end-position during initial commissioning to perfect timing and avoid mechanical hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-75 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, and you need the flexibility to fine-tune the retract end-position on the fly. If your force requirements are lower, stepping down to an 80 mm bore yields 2268 N of pull force, saving space and air consumption. The adjustable rear stopper is strictly a travel end-point setter, not a locking device, so it will not hold the load without live air pressure.
For drop-in ISO 15552 interchangeability, verify the 225 mm stroke, 75 mm adjustment range, PT G1/2 port, and your preferred mounting accessory (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the 225 mm stroke is relatively long for this bore size, ensure adequate external guidance to prevent excessive side-loading on the piston rod.
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 SAIJ125AX225-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. The maximum thrust is 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 225 mm down to 150 mm. It only sets the travel end-point and does not lock or hold the load without continuous air pressure.
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