Airtac SAIJ125 Adjustable Cylinder SAIJ125AX105-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX105-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX105-20S
The AirTAC SAIJ125X105-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 6136N push force at 0.5 MPa and uses a PT tapered G1/2 port. The built-in magnet enables position sensing with CMSE reed or DMSE electronic switches.
With a 105mm nominal stroke and a 20mm adjustment range, you can fine-tune the travel window from 85 to 105mm during commissioning without adding external stops. The SUS420J2 stainless steel rod (code A) enhances durability against side loads, while the extruded aluminum barrel integrates dual sensor grooves.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX105-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX105-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAIJ125AX105-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SAIJ125AX105-20S Is Used
Product Changeover
Dial in the 85-105mm travel window on the fly when switching a production line to a different package size.
Machine Setup
Fine-tune the retract end-position during commissioning without swapping the cylinder or bolting on external stops.
Variable End Stops
Adjust the stroke dynamically to accommodate multiple part lengths on a single assembly fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX105-20S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (3927N push at 0.5 MPa) lacks the necessary thrust, but avoid stepping up to a 160mm bore (10053N) if 6136N is sufficient. Select the SAIJ adjustable-stroke variant over a fixed SAI cylinder when your machine setup requires precise end-position tuning for varying product sizes. The rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding, use an SAIL or BSAI cylinder. Ensure exact ISO 15552 replacement matching by verifying the 125mm bore, 105mm stroke, 20mm adjust, PT port, and -S magnet.
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 SAIJ125AX105-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster allows you to shorten the 105mm nominal stroke by up to 20mm, creating an 85-105mm usable travel window. This stopper only sets the end position and does not lock the load without live air pressure.
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