This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1225S, 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 SI125X1225S
The AirTAC SI125 Standard Cylinder SI125X1225S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1225S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1225S
- 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 SI125X1225S
The AirTAC SI125X1225S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore, 1225mm stroke, and a built-in magnet. Delivering 6136N push force at 0.5MPa, it is directly replaced by the SAI125X1225S. This direct upgrade matches the exact G1/2 port, M27x2 rod thread, and mounting interface, ensuring seamless fixture integration.
The SAI successor upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also adds SAIL, SAIF, and BSAI lock variants. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X1225S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1225S |
| Bore size | Ø125 mm |
| Stroke | 1225 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 SAI125X1225S 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 SAI125X1225S 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 SI125X1225S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1225 | 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 SI125X1225S Is Used
Long-Stroke Material Transfer
Pushes heavy pallets across 1225mm gaps where a 6136N thrust class at 0.5MPa easily overcomes rolling friction.
Large Assembly Press
Actuates heavy tooling over 1225mm, relying on the 40mm adjustable air cushions to decelerate the 125mm bore at stroke ends.
Replacing the Airtac SI125 Standard Cylinder SI125X1225S with the SAI125X1225S
To replace the SI125X1225S, order the SAI125X1225S direct. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/2 port, and the -S magnet for CS1-B/DS1-B switches. The 125mm bore yields 6136N push at 0.5MPa; sizing down to an 80mm bore gives 2513N, while a 160mm bore yields 10053N. Because this is a 1225mm stroke, external guides are critical to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1225S
- ✓ 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 SI125X1225S FAQ
Yes, the SI125X1225S is discontinued. The direct replacement is the SAI125X1225S. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 1225mm stroke, G1/2 port, and mounting interface.
It features a G1/2 port and delivers 6136N push / 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a max force of 1251kgf at 1.0MPa. It operates at 30-500mm/s with a 40mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1225S replacement — usually within 7-8 hours.