Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30 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 SAIJ125AX650-30
The AirTAC SAIJ125X650-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 620-650 mm usable travel window, allowing you to dial back the nominal 650 mm stroke by up to 30 mm during commissioning without adding external stops. In the 125 mm bore class, it delivers 6133 N of push force at 0.5 MPa and 8590 N at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
This variant uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. Unlike a fixed-stroke SAI cylinder, this adjustable model allows precise end-position tuning directly on the machine frame to accommodate product size changes.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30 |
|---|---|
| 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 SAIJ125AX650-30
| 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 SAIJ125AX650-30 Is Used
Variable End Stops
Dial in the exact retract distance within the 620-650 mm window during machine commissioning to accommodate varying material lengths without swapping out the entire cylinder.
Product Changeover
Quickly fine-tune the end-of-stroke position on a production line when switching to a new product size, utilizing the 30 mm rear adjustment screw for rapid mechanical setup.
Heavy-Duty Positioning
Leverage the 8590 N push force at 0.7 MPa to move heavy jigs into place, relying on the built-in air cushion and external stopper for smooth, adjustable deceleration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30 the Right Cylinder?
Choose this 125 mm bore adjustable cylinder when your application requires 6133 N of push force at 0.5 MPa and exact end-position tuning. If your process demands less force, stepping down to an 80 mm bore provides 2513 N of push force at 0.5 MPa, which may be sufficient for lighter loads. Conversely, if you need significantly higher thrust, the 160 mm bore offers 10053 N at 0.5 MPa. The rear adjuster screw acts purely as a mechanical travel stop to set deceleration and end positions; it does not hold the load without live air pressure. For true load-holding requirements without continuous air, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder.
Because the 650 mm stroke is substantial, always use an external guide rail to support the load and prevent excessive side loading on the 32 mm diameter piston rod. When specifying an ISO 15552 replacement, match the 125 mm bore, 650 mm nominal stroke, 30 mm adjustment range, PT port threads, SUS420J2 rod material, and the required mounting style. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR styles found on some other cylinder series.
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 SAIJ125AX650-30 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6133 N of push force and 5734 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster screw lets you shorten the 650 mm nominal stroke by up to 30 mm, creating a 620-650 mm usable travel window. This allows precise end-position tuning at commissioning without needing to add external mechanical stops.
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