Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40 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 SAIJ125X650-40
The AirTAC SAIJ125X650-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a 125mm bore, a 650mm nominal stroke, and a PT tapered port thread. By turning the external stopper screw, you can trim the effective travel back by up to 40mm, creating a precise 610-650mm usable window for exact end-position tuning.
This model utilizes a carbon steel piston rod and operates at speeds between 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides, allowing for the direct mounting of CMSE reed or DMSE electronic switches if a magnet is specified later. The rear adjuster acts strictly as a travel stop to fine-tune deceleration, not as a lock, meaning live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40 |
|---|---|
| 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 SAIJ125X650-40
| 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 SAIJ125X650-40 Is Used
Product Size Changeover
Dial in the 610-650mm stroke window during format changes on packaging lines, allowing rapid adaptation to different carton lengths without changing hardware.
End-Stop Calibration
Fine-tune the final retract position during machine commissioning to achieve precise mechanical alignment, absorbing minor tolerances in the assembly.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to move heavy workpieces or pallets, using the adjustable stop to set safe travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be excessive. The adjustable 610-650mm travel window is ideal for machine setups requiring product-size changeovers, eliminating the need to swap out a fixed-stroke SAI cylinder or bolt on external stops. When specifying a replacement, ensure you match the 125mm bore, 650mm stroke, 40mm adjustment, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the 650mm stroke is substantial, the 32mm carbon steel rod and M27x2 thread will still experience leverage forces; an external guide should be used to prevent side-loading damage. For applications requiring the load to be held without continuous air pressure, this cylinder is insufficient, and a SAIL air-released lock or BSAI clamp-lock cylinder should be evaluated 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 SAIJ125X650-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 650mm nominal stroke by up to 40mm, providing a usable travel window of 610-650mm. It is a travel stop and does not lock the load without live air pressure.
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