Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50S
The AirTAC SAIJ125X125-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125mm bore and a 125mm nominal stroke, dialed back by up to 50mm to provide a precise 75-125mm usable travel window. This adjustment capability allows operators to fine-tune end positions at commissioning or during product changeovers without swapping the entire actuator.
Delivering 6136N of pull force at 0.5MPa (up to 11045N at 0.9MPa), this carbon-rod cylinder is built for heavy loads. It includes a magnetic piston (-S) compatible with AirTAC CMSE reed and DMSE electronic sensors, which mount directly into the dual-side sensor grooves on the extruded aluminum barrel. The standard PT tapered porting and 40mm cushion strokes ensure robust shock absorption.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-50S Is Used
Press Tonnage Calibration
Dial in the exact 75-125mm travel window during press setup to accommodate varying material thicknesses without adding external mechanical stops.
Assembly Line Changeover
Rapidly reconfigure end-of-stroke positions for new product sizes on a high-thrust assembly line, leveraging the 11045N output at 0.9MPa.
Material Testing Jigs
Use the fine-tuning rear screw to set precise compression distances on heavy-duty test fixtures, utilizing the DMSE electronic sensors for exact position feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-50S the Right Cylinder?
Select this 125mm bore actuator when an application demands high thrust combined with variable end-stop positioning. If the 75-125mm adjustable window is excessive or the 6136N pull force at 0.5MPa outpaces your load, stepping down to a 100mm bore yields 3681N pull force. Because the SAIJ series uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), you cannot use FB, CA, CB, or CR brackets.
Choose this adjustable-stroke model over a fixed SAI cylinder when you need live commissioning tweaks rather than a locked travel distance. Note that the rear adjuster functions strictly as a travel stop, not a lock; it will not hold the load without live air pressure. For fail-safe load holding, consider the SAIL or BSAI series instead. As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with ISO 15552 cylinders such as those from Festo or SMC.
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 SAIJ125X125-50S FAQ
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the 125mm nominal stroke by up to 50mm, creating a usable travel window of 75-125mm. This stopper only sets the end position and does not lock the load without air pressure.
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