Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50
The AirTAC SAIJ125X50-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 50mm nominal stroke that can be dialed back by up to 50mm, providing a 0-50mm usable travel window for precise end-position tuning.
Equipped with a carbon steel rod and PT tapered port threads, this extruded aluminum barrel design omits the FB, CA, CB, and CR mounting options, utilizing a reduced set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. The rear screw acts purely as a travel stop for deceleration and is not a locking mechanism.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125X50-50 Is Used
Variable End-Stop Tuning
Dial in the exact retract position from 0 to 50mm during machine commissioning to accommodate different product sizes without changing hardware.
High-Force Clamping
Leverage the 6136N push force at 0.5 MPa to secure heavy workpieces, using the rear adjuster to set the precise clamping depth.
Changeover Optimization
Quickly adapt automated production lines to new component heights by turning the rear stopper screw rather than repositioning the entire cylinder assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-50 the Right Cylinder?
Choose this 125mm bore when you need higher thrust than the 80mm option (2513N push at 0.5 MPa) but want to avoid the larger 160mm footprint. The adjustable 0-50mm window is perfect for product changeovers on a line, allowing you to fine-tune the retract end without swapping the cylinder or adding external stops. If your application requires holding the load without live air pressure, pair this cylinder with an external rod lock or look to the SAIL or BSAI series instead.
For an exact ISO 15552 replacement, match the 125mm bore, 50mm stroke, 50mm adjustment, PT port thread, and your required mounting hardware. Because this is a high-force actuator operating at 30-500mm/s, ensure your structural mounting can handle the dynamic loads.
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 SAIJ125X50-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the effective stroke by up to 50mm from the nominal 50mm stroke, creating a 0-50mm usable travel window. This stopper only sets the travel end and does not lock the load without live air.
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