Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100
The AirTAC SAIJ125X450-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 450 mm stroke that can be fine-tuned backward by up to 100 mm, yielding a usable travel window of 350-450 mm to dial in exact end positions during commissioning.
Belonging to the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and accepts PT tapered port threads with a G1/2 connection. The extruded aluminum barrel includes sensor grooves on both sides, and because no magnet is specified here, position sensing would require ordering a -S variant to utilize CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125X450-100 Is Used
Variable End-Stop Positioning
Dial in the exact retraction point between 350 and 450 mm during machine setup, accommodating different product lengths without changing the cylinder.
Product Changeover Systems
Quickly adjust the stroke window on packaging or sorting lines to handle varying package sizes on the fly, minimizing downtime between production runs.
Heavy-Duty Forming Presses
Leverage the 6136 N pull force at 0.5 MPa to securely form or stamp materials, using the 100 mm adjuster to fine-tune the pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100 the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but a larger 160 mm bore is excessive. The 100 mm adjustment range is perfect for production lines running mixed product sizes, allowing variable end-stops without physically swapping cylinders or adding external stopper blocks.
Because the 450 mm stroke is substantial, an external guide is recommended to protect the 32 mm carbon steel rod from excessive side-loading. Note that the rear adjuster acts only as a travel stop, not a load lock; for dead-air position holding, consider an AirTAC SAIL or BSAI cylinder. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
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 SAIJ125X450-100 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 100 mm from the nominal 450 mm, providing an adjustable travel window of 350-450 mm. This stopper only limits the travel end and does not lock the load without live air pressure.
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