This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1090S, 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 SI125X1090S
The AirTAC SI125 Standard Cylinder SI125X1090S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1090mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1090S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1090 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1090S
- 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 SI125X1090S
The AirTAC SI125X1090S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1090 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X1090S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL and BSAI lock variants the SI lacked. This -S SKU uses CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X1090S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1090S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1090S |
| Bore size | Ø125 mm |
| Stroke | 1090 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 SAI125X1090S 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 SAI125X1090S 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 SI125X1090S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1090 | 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 SI125X1090S Is Used
Long-Stroke Material Transfer
Pushes heavy pallets or workpieces across 1090 mm stations using 6136 N thrust at 0.5 MPa, requiring external guides to prevent rod bending.
Large Fixture Actuation
Indexes heavy machining fixtures along extended 1.09 meter travels, benefiting from the 40 mm adjustable air cushions to decelerate masses.
Replacing the Airtac SI125 Standard Cylinder SI125X1090S with the SAI125X1090S
To replace the SI125X1090S, order the SAI125X1090S ensuring the ISO 15552 interface, 125 mm bore, 1090 mm stroke, G1/2 port, and mounting accessory match. The -S magnet enables CS1-B/DS1-B switches; the SAI uses current AirTAC switches. If sizing down, a 100 mm bore yields 3927 N push at 0.5 MPa; sizing up to 160 mm gives 10053 N. For load holding on air loss, the cushion only decelerates; use an external rod lock, pilot check valve, or SAIL/BSAI variant. With a 1090 mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1090S
- ✓ 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 SI125X1090S FAQ
Yes, the SI125X1090S is discontinued. The direct replacement is the SAI125X1090S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 1090 mm stroke, 6136 N force, G1/2 port, and mounting interface.
It features a G1/2 air port and M27x2 rod thread. Force ratings are: 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, with a theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1090S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1090S replacement — usually within 7-8 hours.