This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX110S, 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 SI125AX110S
The AirTAC SI125 Standard Cylinder SI125AX110S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 110mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX110S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke110 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX110S
- 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 SI125AX110S
The AirTAC SI125AX110S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore, 110mm stroke, and a SUS420J2 stainless piston rod. Delivering 6136N push force at 0.5MPa, it is directly replaced by the SAI125AX110S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread, fitting existing fixtures seamlessly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family expands options with SAIL, SAIF, and BSAI lock variants.
Airtac SI125 Standard Cylinder SI125AX110S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX110S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX110S |
| Bore size | Ø125 mm |
| Stroke | 110 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 SAI125AX110S 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 SAI125AX110S 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 SI125AX110S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×110 | 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 SI125AX110S Is Used
Heavy-Duty Pressing
Drives large stamping and forming dies requiring substantial thrust, utilizing the 6136N push force at 0.5MPa to seat heavy components.
Pallet Lift Stations
Actuates robust lifting platforms in material handling lines, where the 313kg vertical lift capacity handles loaded pallets safely.
Automated Clamp Systems
Secures large workpieces in machining cells, taking advantage of the SUS420J2 stainless rod for corrosion resistance in harsh environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX110S with the SAI125AX110S
To replace the SI125AX110S, order the SAI125AX110S, confirming the ISO 15552 interface, 125mm bore, 110mm stroke, G1/2 port, and mounting accessory. The -A rod specifies SUS420J2 stainless steel, and -S indicates a magnet for CS1-B/DS1-B switches. Sizing both ways: if moving up or down, note the 100mm bore provides 3927N push at 0.5MPa, while the 160mm bore offers 10053N. A plain cylinder does not hold load on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX110S
- ✓ 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 SI125AX110S FAQ
Yes, the SI125AX110S is discontinued. The direct replacement is the SAI125AX110S. It is dimensionally interchangeable per ISO 15552, maintaining the same bore, stroke, force, G1/2 port, and mounting interface.
It features a G1/2 port. The force ratings are 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX110S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX110S replacement — usually within 7-8 hours.