Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20S 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 SAIJ125X650-20S
The AirTAC SAIJ125X650-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, utilizing a 32 mm carbon steel rod with an M27x2 thread. The integrated -S magnet enables precise position detection using AirTAC CMSE reed or DMSE electronic solid-state sensors housed within the dual-side sensor grooves.
This model features a 650 mm nominal stroke that can be fine-tuned down by up to 20 mm, creating a 630-650 mm usable travel window. The rear adjusting screw acts purely as a mechanical stop to set the retract end position during commissioning or product changeovers without requiring external stops. It is a profile cylinder, not a tie-rod design, and operates at speeds between 30-500 mm/s with PT tapered port threading.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20S |
|---|---|
| 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 SAIJ125X650-20S
| 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 SAIJ125X650-20S Is Used
Product Changeover
Dial in the 630-650 mm retract end-stop during format size changes on a packaging line without bolting on external mechanical stops.
Press Positioning
Leverage 6136 N of thrust at 0.5 MPa to seat heavy components, using the rear screw to fine-tune the final pressing depth at commissioning.
Assembly Line Tuning
Adjust the stroke window on the fly during machine setup to accommodate part tolerances, relying on the -S magnet for DMSE sensor feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (delivering 2513 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053 N) would be excessive. The adjustable 630-650 mm stroke window is ideal for setups requiring exact end-position tuning without swapping cylinders. Because the 650 mm stroke is substantial, the 32 mm rod and M27x2 thread provide robust support, but an external guide is recommended to manage side loads on long unsupported travels.
The rear adjuster and air cushions only decelerate the travel end; they do not hold the load without live air. For true load-holding without pneumatic pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) series. This SAIJ model supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. It is dimensionally interchangeable per ISO 15552.
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 SAIJ125X650-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjusting screw allows you to shorten the 650 mm nominal stroke by up to 20 mm, providing a 630-650 mm travel window. It functions as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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