Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-10S 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 SAIJ125X650-10S
The AirTAC SAIJ125X650-10-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 6136N pull force and an 8590N push force at 0.5 MPa, utilizing a 32mm carbon steel rod with an M27x2 thread. By turning the external rear stopper screw, you can fine-tune the effective travel down from the 650mm nominal stroke, creating a precise 640-650mm adjustable window for exact end-position tuning during commissioning.
This model includes a magnet (-S) for electronic position sensing and operates at 30-500 mm/s. The extruded aluminum barrel features sensor grooves on both sides, accepting AirTAC DMSE solid-state sensors for precise switching. It supports a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some standard lines.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-10S |
|---|---|
| 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 SAIJ125X650-10S
| 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 SAIJ125X650-10S Is Used
Machine Changeover
Fine-tune the 640-650mm travel end-stop during product size transitions without physically replacing the cylinder or reconfiguring external hard stops.
Heavy Press Positioning
Leverage the 6136N pull force to securely seat heavy components, using the rear screw to dial in the exact clamping distance.
Assembly Line Tuning
Adjust the retract end-position on the fly during line commissioning to synchronize multiple 125mm bore actuators perfectly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-10S the Right Cylinder?
Choose this 125mm bore when the 80mm bore (delivering 2268N pull at 0.5 MPa) lacks sufficient thrust for heavy positioning tasks. The adjustable stroke is ideal for product changeovers, allowing you to dial in the 640-650mm travel without swapping the cylinder or adding external stops. Because the 650mm stroke is substantial, an external guide is recommended to manage side-load and prevent rod binding.
For a direct ISO 15552 dimensionally interchangeable replacement, match the 125mm bore, 650mm stroke, 10mm adjustment range, PT tapered port thread, and the -S magnet requirement. Remember that the rear adjuster functions strictly as a travel stop, not a lock; this SAIJ cylinder cannot hold a load without live air pressure. For pilot-operated load-holding, consider the SAIL or BSAI series instead.
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 SAIJ125X650-10S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. At 0.7 MPa, the push force increases to 11045N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 650mm nominal stroke by up to 10mm, providing a usable travel window of 640-650mm. It sets the end position but does not lock the load without live air.
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