This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX475S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125AX475S
The AirTAC SI125 Standard Cylinder SI125AX475S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 475mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX475S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX475S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125AX475S
The AirTAC SI125AX475S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore and 475mm stroke. It delivers 6136 N push and 5734 N pull at 0.5 MPa, utilizing a G1/2 port and a SUS420J2 stainless steel rod. AirTAC replaced this legacy unit with the SAI125AX475S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125AX475S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX475S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX475S |
| Bore size | Ø125 mm |
| Stroke | 475 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125AX475S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI125AX475S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125AX475S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×475 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125AX475S Is Used
Heavy Press Operations
Drives large stamping and forming presses requiring up to 11045 N of thrust at 0.9 MPa, utilizing the adjustable 40mm cushion to halt heavy masses smoothly.
Pallet Handling
Shifts loaded pallets over 475mm distances where the 125mm bore provides the necessary push force to overcome guide friction without stalling.
Automated Assembly Lifts
Lifts multi-component chassis subframes vertically, safely handling loads near the 313 kg calculated vertical limit when guided by external rails.
Replacing the Airtac SI125 Standard Cylinder SI125AX475S with the SAI125AX475S
To replace the SI125AX475S, order the SAI125AX475S and verify your ISO 15552 mounting fixtures, G1/2 port, and M27x2 rod thread. The built-in magnet (-S) pairs with legacy CS1-B/DS1-B switches, though the SAI successor uses current AirTAC sensors. If sizing alternatives, the neighboring 100mm bore yields 3927 N push at 0.5 MPa, whereas the 160mm bore provides 10053 N. Note that a standard cylinder drifts without live air since cushions only decelerate; for load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve. Finally, at 475mm, this long stroke demands external guides to prevent rod bending and excessive side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX475S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125AX475S FAQ
Yes, the SI125AX475S is discontinued. The direct replacement is the SAI125AX475S. It shares the identical ISO 15552 mounting interface, 125mm bore, 475mm stroke, G1/2 port, and output force, fitting directly into your existing fixtures.
The 125mm bore generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa. The operating speed range is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX475S
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