Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30
The AirTAC SAIJ125X55-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 25 to 55 mm, letting you dial back the nominal 55 mm stroke by up to 30 mm during machine commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks with precision.
The rear adjuster acts purely as a travel stop to set deceleration and end limits; it does not hold the load without live air pressure. This extruded aluminum barrel includes sensor grooves on both sides, and the carbon steel rod with an M27x2 thread provides robust side-load resistance for heavy fixtures.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125X55-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125X55-30 Is Used
Variable End Stops
Dial in the exact 25 to 55 mm travel limit during machine setup to accommodate different material thicknesses without changing cylinders.
Product Changeover
Quickly reposition the rear stopper on the line when switching product sizes, leveraging 6136 N of thrust to handle heavy actuators.
Commissioning Fine-Tune
Trim the stroke by up to 30 mm to perfect end-position timing and deceleration at the retract end without external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30 the Right Cylinder?
Choose this 125 mm bore when 6136 N of push force at 0.5 MPa is required, or step down to an 80 mm bore providing 2513 N if your load is lighter. The adjustable 25 to 55 mm travel window is ideal for product changeovers where the exact end position varies, eliminating the need to swap a fixed-stroke SAI cylinder or bolt on external stops. For any load-holding requirements without continuous air pressure, use a SAIL or BSAI cylinder instead of relying on the rear stopper.
This configuration uses PT tapered ports, a carbon steel rod, and no magnet. It is dimensionally interchangeable per ISO 15552 and supports a reduced mounting set including 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 SAIJ125X55-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at the maximum 1.0 MPa pressure.
The rear adjuster screw lets you shorten the effective stroke by up to 30 mm, creating a 25 to 55 mm usable travel window. It functions as an end-position stop for fine-tuning, not a load-holding lock.
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