This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X890S, 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 SI125X890S
The AirTAC SI125 Standard Cylinder SI125X890S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 890mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X890S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke890 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X890S
- 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 SI125X890S
The AirTAC SI125X890S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 890 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a G1/2 port, M27x2 rod thread, and adjustable air cushions. The direct replacement is the SAI125X890S, which matches the bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line. Your -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI125 Standard Cylinder SI125X890S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X890S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X890S |
| Bore size | Ø125 mm |
| Stroke | 890 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 SAI125X890S 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 SAI125X890S 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 SI125X890S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×890 | 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 SI125X890S Is Used
Heavy Press Ejection
Provides the 6136 N push force at 0.5 MPa needed to reliably eject heavy stamped parts from press beds over extended distances.
Pallet Diversion
Leverages the 890 mm stroke to actuate large diverter arms, pushing heavy pallets smoothly onto parallel conveyor lines.
Roller Lift Gates
Raises and lowers powered roller conveyor sections for human or forklift traffic, using the long stroke and robust 125 mm bore thrust.
Replacing the Airtac SI125 Standard Cylinder SI125X890S with the SAI125X890S
To replace the SI125X890S, order the SAI125X890S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port, and the -S magnet requirement. Sizing context: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Because this is an 890 mm stroke, prevent rod bending by guiding the load externally to avoid side loads. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve. The operating speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X890S
- ✓ 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 SI125X890S FAQ
Yes, the SI125X890S is discontinued. The direct replacement is the AirTAC SAI125X890S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 890 mm stroke, output force, G1/2 port, and mounting accessories.
This 125 mm bore cylinder uses a G1/2 port. At 0.5 MPa it provides 6136 N push and 5734 N 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 SAI125X890S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X890S replacement — usually within 7-8 hours.