This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX35, 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 SI125AX35
The AirTAC SI125 Standard Cylinder SI125AX35 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 35mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX35, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX35
- 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 SI125AX35
The AirTAC SI125AX35 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 35 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a G1/2 port, an M27x2 rod thread, and a SUS420J2 stainless steel piston rod. As this legacy unit is end-of-life, the direct replacement is the SAI125AX35.
The SAI125AX35 shares the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note this no-S SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125AX35 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX35 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX35 |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAI125AX35 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 SAI125AX35 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 SI125AX35
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SI125AX35 Is Used
Heavy Press Operations
Ideal for high-tonnage pressing and forming tasks requiring 6136 N of thrust at 0.5 MPa within a compact 35 mm stroke.
Pallet Clamping
Provides robust holding force for securing heavy pallets or fixtures in automated material handling systems.
Rigid Actuation
Excels in short-stroke, high-force industrial automation where a durable SUS420J2 stainless rod resists corrosion.
Replacing the Airtac SI125 Standard Cylinder SI125AX35 with the SAI125AX35
To replace the SI125AX35, order the SAI125AX35, confirming the ISO 15552 interface, 125 mm bore, 35 mm stroke, G1/2 port, and SUS420J2 rod. This no-magnet SKU cannot accept a CS1-B/DS1-B sensor; if sensing is needed, specify an -S model. Sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX35
- ✓ 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 SI125AX35 FAQ
Yes, the AirTAC SI125AX35 is discontinued. The direct replacement is the SAI125AX35. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 35 mm stroke, output force, G1/2 port, and mounting interface to fit existing fixtures directly.
This 125 mm bore cylinder features a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX35
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX35 replacement — usually within 7-8 hours.