Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S
The AirTAC SAIJ125X650-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 600 to 650 mm. It integrates a magnetic piston for position detection and features a carbon steel rod with PT tapered ports. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This adjustable-stroke design allows precise end-position tuning during commissioning without swapping the cylinder or adding external stops. The rear screw acts purely as a travel stop for deceleration, not a load-holding lock. It supports AirTAC CMSE reed and DMSE electronic sensors, utilizing the dual sensor grooves machined into the extruded aluminum barrel.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125X650-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125X650-50S Is Used
Product Size Changeovers
Dial in the 50 mm adjustment window to accommodate varying product lengths on the fly without physically replacing the actuator.
Heavy-Duty Pressing
Leverage the 6136 N push force at 0.5 MPa for precise pressing operations where the final end-stop needs micro-tuning at commissioning.
Automated Assembly Stops
Set variable retract end-positions for modular assembly lines, using the rear stopper to define the exact 600 to 650 mm travel limit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S the Right Cylinder?
Choose this 125 mm bore when a step up from the 80 mm bore (which provides 2513 N push at 0.5 MPa) is required for higher thrust demands. The adjustable 600-650 mm window is ideal for product-size changeovers on a line, whereas a fixed SAI cylinder is better for static, unchanging end positions. To match this ISO 15552 replacement exactly, specify the 650 mm stroke, 50 mm adjustment, PT port thread, and the -S magnet option.
Because the stroke is 650 mm, the 32 mm rod diameter requires an external guide to prevent excessive side-loading and premature seal wear. If the application requires holding the load without live air pressure, a plain SAIJ cannot perform this function; you must integrate an external rod lock or select an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X650-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster allows you to trim the nominal 650 mm stroke back by up to 50 mm, creating a 600 to 650 mm usable travel window. The adjuster is a mechanical stop for setting the end position and does not lock the load without continuous air pressure.
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