This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X11, 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 SI125X11
The AirTAC SI125 Standard Cylinder SI125X11 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 11mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X11, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke11 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X11
- 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 SI125X11
The AirTAC SI125X11 is a discontinued double-acting ISO 15552 profile cylinder with a non-standard 11 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X11, which shares the exact ISO 15552 mounting interface, bore, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X11 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X11 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X11 |
| Bore size | Ø125 mm |
| Stroke | 11 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 SAI125X11 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 SAI125X11 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 SI125X11
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×11 | 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 SI125X11 Is Used
Short-Stroke Clamping
Ideal for high-force 11 mm clamping tasks in heavy fixtures, utilizing the 6136 N thrust at 0.5 MPa to secure large steel components during machining.
Heavy Ejection
Provides a compact 125 mm bore ejection burst in stamping presses, moving heavy parts out of the die zone quickly within the 30-500 mm/s speed range.
Rigid Holding
Acts as a short-travel stop or holding brake in automated lines, though an external pilot check valve is required to prevent drift on air loss.
Replacing the Airtac SI125 Standard Cylinder SI125X11 with the SAI125X11
To replace the discontinued SI125X11, order the SAI125X11. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/2 port thread (PT/G/NPT), and M27x2 rod end. Because this is a non-standard 11 mm stroke, confirm the exact dimensional footprint with the datasheet. As a non-magnetized SKU, it cannot support position sensing. For sizing context, a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X11
- ✓ 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 SI125X11 FAQ
Yes, the SI125X11 is discontinued. The direct replacement is the SAI125X11. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 11 mm stroke, 6136 N force, G1/2 port, and mounting interface.
The bore uses a G1/2 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 SAI125X11
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X11 replacement — usually within 7-8 hours.