Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 165mm 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
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50S
The AirTAC SAIJ125X165-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 115 to 165 mm, enabling precise end-position tuning during commissioning without swapping the barrel. Operating at 0.5 MPa, it delivers 6136 N of pull force and 5734 N of pull thrust, making it suitable for heavy-duty positioning tasks.
This unit features a carbon steel piston rod and PT tapered ports. The -S variant includes a magnet for position sensing, compatible with AirTAC CMSE reed and DMSE electronic solid-state switches housed in the dual-side sensor grooves. It supports a speed range of 30-500 mm/s and utilizes a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 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 SAIJ125X165-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×165 | 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 SAIJ125X165-50S Is Used
Machine Changeover
Dial in the exact 115 to 165 mm end-stop during product size transitions without physically replacing the actuator.
Heavy Payload Positioning
Leverage the 6136 N pull force to move heavy fixtures, relying on the external stop for repeatable final positioning.
Assembly Line Indexing
Fine-tune the stroke length on the fly to accommodate varying part dimensions in automated assembly machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50S the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm bore (providing 3681 N pull force at 0.5 MPa) lacks the necessary power for your heavy payloads. The 50 mm adjustment window is ideal for product changeovers on a production line, allowing you to dial in the exact end-stop mechanically rather than reprogramming a fixed-stroke SAI cylinder. Remember that the rear adjuster functions purely as a travel stop to decelerate the stroke, not as a locking device. For load-holding without live air pressure, consider the SAIL or BSAI series. As an ISO 15552 interchangeable cylinder, verify your replacement parameters: 125 mm bore, 165 mm stroke, 50 mm adjustment, PT ports, and the -S magnet option.
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 SAIJ125X165-50S FAQ
It has a nominal 165 mm stroke that can be adjusted back by up to 50 mm, creating a usable travel window of 115 to 165 mm. At 0.5 MPa, it outputs 6136 N of push force and 5734 N of pull force.
No, the rear adjuster acts only as a mechanical stop to set the travel end and does not lock the load. For position holding without live air pressure, you should use an external rod lock or the AirTAC SAIL/BSAI cylinder series.
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