This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X260SFA, 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 SI125X260SFA
The AirTAC Airtac SI125 Standard Cylinder SI125X260SFA 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 SAI125X260SFA, 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 → SAI125X260SFA
- 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 SI125X260SFA
The AirTAC SI125X260SFA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 260 mm stroke, and FA flange mounting. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X260SFA, sharing the same interface, force, and stroke.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds variants the SI lacked, like the SAIL lock and BSAI clamp-lock. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current switches.
Airtac SI125 Standard Cylinder SI125X260SFA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X260SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X260SFA |
| 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 SAI125X260SFA 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 SAI125X260SFA 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 SI125X260SFA
| 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 SI125X260SFA Is Used
Heavy Pressing
Applies 6136 N of push force at 0.5 MPa for seating heavy machinery components and forming operations.
Pallet Diversion
Handles high-load routing and stopping of loaded pallets using the robust FA flange mount interface.
Replacing the Airtac SI125 Standard Cylinder SI125X260SFA with the SAI125X260SFA
To replace the SI125X260SFA, order the SAI125X260SFA. Confirm the ISO 15552 mounting interface, 125 mm bore, 260 mm stroke, G1/2 port (PT/G/NPT thread options), FA flange, and the -S magnet. This cylinder provides 6136 N push at 0.5 MPa; if undersized, the 160 mm bore offers 10053 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use the SAIL or BSAI lock variant, or an external pilot check valve. The 32 mm rod and M27x2 thread must match your mechanics. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X260SFA
- ✓ 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 SI125X260SFA FAQ
Yes, the SI125X260SFA is discontinued. The direct replacement is the SAI125X260SFA. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 260 mm stroke, G1/2 port, FA flange, and force ratings.
The 125 mm bore uses a G1/2 port with a 32 mm rod. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X260SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X260SFA replacement — usually within 7-8 hours.