Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50S
The 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
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.
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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. 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.
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?
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
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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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
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