This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX175, 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 SI125AX175
The AirTAC SI125 Standard Cylinder SI125AX175 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 175mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX175, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX175
- 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 SI125AX175
The AirTAC SI125AX175 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 175mm stroke. Delivering 6136N push force at 0.5MPa via a G1/2 port, it is replaced by the SAI125AX175. This direct successor matches the exact interface, bore, stroke, force and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This SKU uses a SUS420J2 stainless rod and lacks a magnet, so it cannot take a sensor. For locked loads, explore the SAIL or BSAI variants.
Airtac SI125 Standard Cylinder SI125AX175 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX175 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX175 |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAI125AX175 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 SAI125AX175 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 SI125AX175
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SI125AX175 Is Used
Heavy Stamping
Drives large press beds and heavy stamping fixtures requiring 6136N of thrust at 0.5MPa with a robust 32mm rod.
Pallet Handling
Indexes loaded pallets on conveyors, utilising the 175mm stroke to push heavy goods smoothly into packing stations.
Automated Clamping
Secures large metal or composite parts for machining, relying on the SUS420J2 stainless rod for moisture resistance.
Replacing the Airtac SI125 Standard Cylinder SI125AX175 with the SAI125AX175
To replace the SI125AX175, order SAI125AX175 to keep the exact 125mm bore, 175mm stroke, G1/2 port, M27x2 thread and ISO 15552 mounting. The SUS420J2 rod resists corrosion, and because this SKU lacks a magnet (-S), it cannot accept position sensors. For sizing, a neighbouring 100mm bore yields 3927N at 0.5MPa, while a 160mm bore gives 10053N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding. The SAIL or BSAI lock variants offer integrated holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX175
- ✓ 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 SI125AX175 FAQ
Yes, the SI125AX175 is discontinued. The direct replacement is the SAI125AX175. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 175mm stroke, 6136N force, G1/2 port and mounting interface.
The G1/2 port feeds a 125mm bore yielding 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 SAI125AX175
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX175 replacement — usually within 7-8 hours.