This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1120S, 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 SI125X1120S
The AirTAC SI125 Standard Cylinder SI125X1120S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1120mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1120S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1120S
- 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 SI125X1120S
The AirTAC SI125X1120S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1120 mm stroke. It delivers 6136 N push force at 0.5 MPa and uses a G1/2 port. AirTAC replaced this legacy unit with the SAI125X1120S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X1120S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1120S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1120S |
| Bore size | Ø125 mm |
| Stroke | 1120 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 SAI125X1120S 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 SAI125X1120S 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 SI125X1120S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1120 | 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 SI125X1120S Is Used
Heavy Stamping Press
Drives large platens and heavy dies requiring 6136 N of push force at 0.5 MPa over a 1120 mm travel distance.
Automated Assembly Lift
Raises multi-stage product racks using the G1/2 port and M27x2 rod thread, needing external guides for the long stroke.
Replacing the Airtac SI125 Standard Cylinder SI125X1120S with the SAI125X1120S
To replace the SI125X1120S, order the SAI125X1120S. Confirm the ISO 15552 mounting interface, the 125 mm bore, the 1120 mm stroke, the G1/2 port (available in PT, G or NPT), and the -S magnet for position sensing. Sizing both ways: if you need less force, the 100 mm bore offers 3927 N push at 0.5 MPa; if you need more, the 160 mm bore provides 10053 N. A plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use the SAIL or BSAI lock variant, or an external pilot check valve. Because the 1120 mm stroke is long, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1120S
- ✓ 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 SI125X1120S FAQ
Yes, the SI125X1120S is discontinued. The direct replacement is the SAI125X1120S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 1120 mm stroke, 6136 N force, G1/2 port and mounting accessories.
The 125 mm bore provides 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. Operating speed is 30-500 mm/s. The -S magnet works with legacy CS1-B/DS1-B switches.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1120S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1120S replacement — usually within 7-8 hours.