Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50S 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 SAIJ125X225-50S
The AirTAC SAIJ125X225-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N push force at 0.5MPa and provides a usable travel window of 175 to 225mm. This allows you to fine-tune the retract end position at commissioning without swapping out the cylinder or adding external stops.
Equipped with a magnet for position sensing, it supports AirTAC CMSE reed and DMSE electronic switches. The 32mm carbon steel rod with an M27x2 thread handles high side loads, while the extruded aluminum barrel includes sensor grooves on both sides. It operates at 30-500mm/s and uses PT tapered ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50S |
|---|---|
| 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 SAIJ125X225-50S
| 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 SAIJ125X225-50S Is Used
Variable End-Stop Machining
Dial in the 175-225mm travel window during machine setup to accommodate different part lengths without changing the cylinder.
Product Changeover Diversion
Adjust the retract stroke by up to 50mm on the fly to handle varying package sizes on a packaging line.
Heavy-Duty Pressing
Leverage the 6136N thrust at 0.5MPa for assembly operations while fine-tuning the final press depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50S the Right Cylinder?
Choose this 125mm bore when the 80mm bore's 2513N push force at 0.5MPa is insufficient for your heavy-duty setup. The 50mm adjustment range is ideal for product changeovers on a line, letting you dial in the exact end-stop without mechanical rebuilds. For any stroke of 225mm, ensure external guides support the load to prevent rod binding.
The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. If your application requires true load-holding during pressure loss, consider the SAIL pneumatic lock or BSAI clamp-lock cylinders. This SAIJ model ensures dimensional interchangeability per ISO 15552 mounting interfaces.
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 SAIJ125X225-50S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9MPa.
The rear adjuster screw allows you to shorten the nominal 225mm stroke by up to 50mm, creating a usable travel window of 175-225mm. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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