This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX190, 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 SI125AX190
The AirTAC SI125 Standard Cylinder SI125AX190 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 190mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX190, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke190 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX190
- 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 SI125AX190
The AirTAC SI125AX190 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 190 mm stroke, and a SUS420J2 stainless steel piston rod. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125AX190, which shares the exact ISO 15552 mounting interface, G1/2 port, and output force.
The SAI upgrade features a new two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot take a sensor. For load holding, use an external rod lock or pilot check valve, as the SAIL or BSAI lock variants offer integrated braking.
Airtac SI125 Standard Cylinder SI125AX190 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX190 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX190 |
| Bore size | Ø125 mm |
| Stroke | 190 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 SAI125AX190 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 SAI125AX190 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 SI125AX190
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×190 | 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 SI125AX190 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring high thrust, using the 6136 N push force at 0.5 MPa to form thick metal components.
Platen Clamping
Clamps large industrial platens in manufacturing lines, relying on the robust 32 mm SUS420J2 stainless rod to resist corrosion and side loads.
Replacing the Airtac SI125 Standard Cylinder SI125AX190 with the SAI125AX190
To replace the SI125AX190, order the SAI125AX190 and confirm the ISO 15552 mounting interface, 125 mm bore, 190 mm stroke, G1/2 port, and SUS420J2 rod. Since this SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor. If you need position sensing, select a magnet-equipped SAI. Sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. The 125 mm bore generates 8590 N at 0.7 MPa. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For secure load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The SAIF self-valve variant is unavailable for this bore.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX190
- ✓ 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 SI125AX190 FAQ
Yes, the SI125AX190 is discontinued. The direct replacement is the SAI125AX190. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 190 mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder has a G1/2 port. It delivers 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 force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX190
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX190 replacement — usually within 7-8 hours.