Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100
The AirTAC SAIJ125X155-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a substantial 6136N pull force at 0.5 MPa and uses a PT tapered port thread. With a nominal 155mm stroke and a 100mm adjustment range, it delivers a highly flexible usable travel window of 55 to 155mm. This wide tuning band is ideal for machinery requiring significant end-position variance during product changeovers.
The rear adjuster acts purely as a mechanical stop to set the retract position and does not hold the load without live air pressure. For load-holding without continuous supply, an external rod lock or SAIL cylinder is required. The extruded aluminum barrel includes sensor grooves on both sides, and the standard carbon steel rod pairs with a 32mm diameter and M27x2 thread to handle high side loads effectively.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-100 Is Used
Variable End-Stop Tuning
Dial in the exact retract position from 55 to 155mm during machine commissioning to perfect end-of-stroke contact without adding external physical stops.
Product Size Changeover
Quickly adapt the cylinder travel on packaging lines handling varying container sizes, utilizing the full 100mm adjustment band to switch profiles rapidly.
High-Force Positioning
Leverage 6136N of pulling force at 0.5MPa for heavy pressing or holding tasks, relying on the 32mm carbon steel rod to maintain rigidity under load.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-100 the Right Cylinder?
Select this 125mm bore when an application demands high force (6136N pull at 0.5MPa) alongside a highly variable stroke window. If your setup needs less force, stepping down to an 80mm bore yields 2268N pull, whereas a 160mm bore offers 9425N for heavier loads. The 100mm adjustment range is perfect for prototyping or lines running multiple product sizes, removing the need to swap cylinders for different travel requirements.
Unlike a fixed-stroke SAI cylinder, this SAIJ model allows precise retract tuning at commissioning. It supports a speed range of 30-500mm/s and uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB and rear pivot options. Since it lacks a magnet, position sensing requires a separate external sensor or a custom build.
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 SAIJ125X155-100 FAQ
It features a rear mechanical stopper that allows you to shorten the effective stroke by up to 100mm. This creates a usable travel window of 55 to 155mm, enabling fine-tuning of the end position without replacing the cylinder.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. The operational speed range for this 125mm bore is 30-500mm/s.
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