Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75S 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 SAIJ125AX155-75S
The AirTAC SAIJ125X155-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the rear stopper screw, you unlock an 80-155 mm usable travel window, allowing precise end-position tuning without swapping out the barrel. This model features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a built-in magnet for position sensing.
Unlike a fixed-stroke SAI, this adjustable variant excels at machine changeovers, letting you dial in the exact retract stop on the fly. The rear adjuster acts purely as a mechanical stop to set deceleration and end-position, meaning it will not hold a load safely without live air pressure. For true load-holding requirements, consider the SAIL or BSAI series. It uses PT tapered port threads (G1/2) and operates at speeds of 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75S |
|---|---|
| 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 SAIJ125AX155-75S
| 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 SAIJ125AX155-75S Is Used
Variable End-Stop Actuation
Perfect for test fixtures requiring different retract distances, utilizing the 80-155 mm travel window to accommodate multiple part geometries on a single fixture.
Product Size Changeover
Enables rapid line changeovers on packaging equipment by dialing in the stroke via the rear screw rather than replacing the entire ISO 15552 cylinder assembly.
High-Force Positioning
Leverages the 6136N thrust at 0.5 MPa for heavy clamping or pressing tasks, with fine-tuning available at commissioning to prevent overtravel damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75S the Right Cylinder?
Selecting this 125 mm bore makes sense when your application requires high force (6136N push at 0.5 MPa or 8590N at 0.7 MPa) alongside flexible end-positioning. If your setup only needs lighter actuation, stepping down to a 100 mm bore yields 3927N at 0.5 MPa. The generous 75 mm adjustment range is ideal for prototyping or production lines handling varying product sizes, replacing the need to bolt on external stops. When ordering for ISO 15552 interchangeability, match the 155 mm stroke, 75 mm adjustment, PT port, and the -S magnet option.
Because the nominal stroke is 155 mm, side-load risks are moderate, but you should still ensure proper guiding for heavy loads. The rod material is SUS420J2 stainless steel (code A), and the mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. The -S magnet integrates seamlessly with AirTAC CMSE reed switches and DMSE electronic sensors mounted in the dual-side sensor grooves.
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 SAIJ125AX155-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7 MPa, the push force reaches 8590N.
The rear adjuster screw allows you to trim the effective stroke by up to 75 mm. With a nominal stroke of 155 mm, this creates a usable travel window of 80-155 mm, which can be fine-tuned during commissioning without needing external stops.
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