Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50S 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 SAIJ125X450-50S
The AirTAC SAIJ125X450-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 450mm nominal stroke that can be dialed back by up to 50mm, yielding a 400-450mm usable travel window. This built-in adjustability allows operators to fine-tune end positions during commissioning without adding external stops.
This -S variant includes a magnet for position sensing and is wired for AirTAC CMSE reed and DMSE electronic solid-state switches. The extruded aluminum barrel provides standard ISO 15552 mounting dimensions, while the 32mm carbon steel rod and M27x2 thread handle high side loads. It supports a speed range of 30-500mm/s and uses PT tapered ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50S |
|---|---|
| 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 SAIJ125X450-50S
| 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 SAIJ125X450-50S Is Used
Product Changeovers
Dial in the 400-450mm retract position during format size changes on a packaging line without physically replacing the cylinder.
Machine Setup
Fine-tune the end-of-stroke stopping point during initial commissioning to prevent overtravel and crush damage to tooling.
Variable End Stops
Provide a customizable mechanical stop for heavy assembly presses requiring 6136N of thrust at 0.5 MPa operating pressure.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50S the Right Cylinder?
Select this 125mm bore cylinder when an 80mm bore (2513N push at 0.5 MPa) lacks the thrust for your process, but a 160mm bore (10053N) would be excessive overkill. The 50mm adjustment window is perfect for product changeovers on a line, letting you shift the retract end-stop dynamically rather than swapping out a fixed-stroke SAI cylinder. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for dead-air load holding, consider an external pilot-operated check valve, or AirTAC SAIL and BSAI locking cylinders.
Because the 450mm stroke is substantial, always use an external guide to support the load and prevent excessive side-loading on the rod seal. This model is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting 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 SAIJ125X450-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At a maximum 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 450mm nominal stroke by up to 50mm, creating a 400-450mm travel window. It only sets the end position and does not lock the load without live air pressure.
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