Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20 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 SAIJ125X375-20
The AirTAC SAIJ125X375-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 375 mm stroke that can be fine-tuned backward by up to 20 mm, yielding a precise 355-375 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning while utilizing a standard extruded aluminum barrel with dual sensor grooves.
This configuration features a robust 32 mm carbon steel rod and M27x2 piston thread, engineered to withstand substantial side loads. The rear stopper mechanism allows technicians to dial in the exact retract end-position during commissioning without adding external stops. Note that the adjuster acts purely as a travel limit and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20 |
|---|---|
| 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 SAIJ125X375-20
| 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 SAIJ125X375-20 Is Used
Variable End-Stop Tuning
Dial in the retract position within the 355-375 mm window during machine commissioning to accommodate varying material thicknesses without external stopper blocks.
Heavy Product Changeover
Leverage the 6136 N push force to shift heavy pallets or fixtures, adjusting the stroke by up to 20 mm on the fly for different product sizes on the same line.
Press Fit Calibration
Fine-tune the end-of-stroke position to perfect press-fit depths, relying on the rear stopper to set the limit rather than swapping out the entire cylinder.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-20 the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm variant steps the thrust up significantly from 3927 N to 6136 N at 0.5 MPa. The adjustable stroke is chosen over a fixed SAI cylinder when a machine requires variable end-stops for product changeovers, saving the cost of swapping hardware. When specifying a replacement, ensure the 375 mm stroke, 20 mm adjustment, PT G1/2 port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) match your footprint.
Because the stroke is 375 mm, the unsupported rod extension is considerable. Despite the heavy 32 mm rod, an external guide is recommended to prevent binding. For applications requiring the load to be held without continuous air pressure, a standard SAIJ is insufficient; consider the SAIL or BSAI locking cylinders instead.
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 SAIJ125X375-20 FAQ
It features a rear external screw that acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 20 mm. This creates a usable travel window of 355-375 mm without changing the cylinder itself.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 8590 N push at 0.7 MPa.
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