This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X260FA, 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 SI125X260FA
The AirTAC SI125 Standard Cylinder SI125X260FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 260mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X260FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X260FA
- 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 SI125X260FA
The AirTAC SI125X260FA is a discontinued double-acting ISO 15552 profile cylinder with an FA flange mount, delivering 6136 N push force at 0.5 MPa. AirTAC replaced it with the SAI125X260FA, a direct upgrade retaining the exact 125 mm bore, 260 mm stroke, G1/2 port, and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL and BSAI lock variants the SI lacked. This SKU lacks a magnet, so it cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X260FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X260FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X260FA |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAI125X260FA 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 SAI125X260FA 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 SI125X260FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SI125X260FA Is Used
Heavy Pressing
Drives large stamping or forming presses requiring 6136 N thrust at 0.5 MPa with a 260 mm stroke.
Clamp Actuation
Secures heavy industrial workpieces using the FA flange mount to withstand high side loads.
Material Lowering
Lowers 313 kg payloads vertically, relying on adjustable 40 mm cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI125 Standard Cylinder SI125X260FA with the SAI125X260FA
To replace the SI125X260FA, order the SAI125X260FA. Confirm the FA flange interface, 125 mm bore, 260 mm stroke, and G1/2 port. Because this SKU has no -S magnet, it cannot accept CS1-B/DS1-B switches. For sizing, the 6136 N push at 0.5 MPa handles ~3682 N safely; if undersized, the 160 mm bore offers 10053 N. A plain cylinder drifts on air loss, so use an external rod lock or pilot check valve for holding. At 260 mm stroke, side-load is minimal, but always guide the load to prevent rod bending. The SAI family also offers SAIF valve and SAIL lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X260FA
- ✓ 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 SI125X260FA FAQ
Yes, the SI125X260FA is discontinued. The direct replacement is the SAI125X260FA. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 260 mm stroke, G1/2 port, and FA flange mount.
It features a G1/2 port. Force output is 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. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X260FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X260FA replacement — usually within 7-8 hours.