This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX240, 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 SI125AX240
The AirTAC SI125 Standard Cylinder SI125AX240 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 240mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX240, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX240
- 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 SI125AX240
The AirTAC SI125AX240 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 240 mm stroke. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125AX240, which shares the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread for seamless fixture integration.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI125AX240 variant uses an SUS420J2 stainless steel rod (A suffix) and lacks a magnet, so it cannot accept position switches.
Airtac SI125 Standard Cylinder SI125AX240 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX240 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX240 |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAI125AX240 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 SAI125AX240 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 SI125AX240
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SI125AX240 Is Used
Heavy Press Operations
Ideal for applying high clamping forces in automated stamping and forming presses where the 6136 N thrust at 0.5 MPa is required.
Pallet Positioning
Provides the robust push power needed to index heavy loaded pallets along conveyor lines in distribution hubs.
Large Mold Handling
Shifts substantial injection molds or tooling bases within manufacturing cells, utilizing the 240 mm stroke for precise transitions.
Replacing the Airtac SI125 Standard Cylinder SI125AX240 with the SAI125AX240
To replace the SI125AX240, order the SAI125AX240. Verify your ISO 15552 mounting hardware (LB, FA, TC, etc.), the G1/2 air port, and the 240 mm stroke. Because this SKU lacks a magnet (-S), it cannot support CS1-B/DS1-B sensors; if sensing is needed, specify an SAI125X240S. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; dropping to a 100 mm bore gives 3927 N, while increasing to 160 mm provides 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants. Since the 240 mm stroke is under 300 mm, rod bending is minimal, but ensure adequate guidance for the 32 mm rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX240
- ✓ 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 SI125AX240 FAQ
Yes, the SI125AX240 is discontinued. The direct replacement is the SAI125AX240. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 240 mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder has a G1/2 port. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX240
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX240 replacement — usually within 7-8 hours.