Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40
The AirTAC SAIJ125X375-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. Its 375 mm nominal stroke can be fine-tuned down by up to 40 mm, creating a precise 335-375 mm usable travel window for product changeovers without external stops. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet, meaning position sensing requires adding one.
Built with an SUS420J2 stainless steel rod (material code A) and PT tapered port threads, this 125 mm bore unit handles heavy loads using a 32 mm rod and M27x2 thread. The rear adjuster acts purely as a mechanical stop to set the retract end position, while the standard air cushions manage deceleration. Neither feature will hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125AX375-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125AX375-40 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 335-375 mm window during machine setup to accommodate different material thicknesses without changing hardware.
Product Size Changeover
Quickly adjust the stroke end position on packaging or sorting lines when switching between different product dimensions on the fly.
Heavy-Duty Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or forming tasks that require precise, repeatable end-of-stroke positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust, stepping up from an 80 mm bore that provides 2513 N at 0.5 MPa. The adjustable 335-375 mm window is ideal for commissioning fine-tuning or accommodating slight product size variations on a line, avoiding the need to swap out a fixed-stroke SAI cylinder. Because the 375 mm stroke is substantial, an external guide is recommended to prevent excessive side loading on the rod.
For an exact ISO 15552 replacement, match the 125 mm bore, 375 mm stroke, 40 mm adjustment, PT port, and mounting choice. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If the machine requires true load-holding without live air, this standard adjuster stop is insufficient; consider an external rod lock, a pilot-operated check valve, or the AirTAC SAIL and BSAI locking cylinder variants.
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 SAIJ125AX375-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. The maximum thrust is 1251 kgf at 1.0 MPa.
The rear mechanical adjuster allows you to shorten the 375 mm nominal stroke by up to 40 mm, providing a usable travel range of 335-375 mm. It functions as a physical stop and does not lock the load without live air.
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