Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50S
The AirTAC SAIJ125X750-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel window to 700-750 mm. Delivering a robust 6136 N pull force at 0.5 MPa, it handles heavy-duty positioning tasks with ease. The extruded aluminum barrel includes dual sensor grooves compatible with CMSE reed and DMSE solid-state switches.
Because the rear adjuster acts purely as a mechanical stop, it allows precise end-position tuning during commissioning without adding external stops or swapping the cylinder. Note that this adjuster does not hold the load without live air; for fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125X750-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125X750-50S Is Used
Variable End Stops
Fine-tune the 700-750 mm travel window during machine setup to accommodate changing product dimensions without replacing the entire actuator.
Heavy-Duty Changeover
Leverage the 6136 N pull force to push heavy pallets or molds, adjusting the rear stopper quickly when switching between product families on the line.
Sensor-Ready Positioning
Utilize the integrated magnet with DMSE solid-state sensors to confirm end-of-stroke positions accurately, even when the travel is dialed back from 750 mm.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50S the Right Cylinder?
Choose this 125 mm bore when 80 mm falls short (2268 N pull at 0.5 MPa) but a 160 mm bore is excessive. The 50 mm adjustment range is perfect for product changeovers on packaging lines, letting you dial in the exact 700-750 mm stroke on the fly rather than machining custom spacers for a fixed-stroke SAI cylinder.
At 750 mm of travel, the 32 mm rod and M27x2 thread provide high structural integrity, but an external guide rail is strongly recommended to prevent rod side-loading. This SAIJ variant uses a PT tapered port and supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. It is dimensionally interchangeable with ISO 15552 cylinders such as the Festo DSBC or SMC NC1.
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 SAIJ125X750-50S FAQ
The rear mechanical stopper allows you to shorten the nominal 750 mm stroke by up to 50 mm, creating a usable travel window of 700-750 mm. This enables precise end-position tuning at commissioning without swapping the cylinder.
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N at 0.7 MPa. It is designed for heavy-load pushing and pulling within its 30-500 mm/s speed range.
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