This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X260S, 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 SI125X260S
The AirTAC SI125 Standard Cylinder SI125X260S 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 SAI125X260S, 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 → SAI125X260S
- 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 SI125X260S
The AirTAC SI125X260S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 260 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a G1/2 port, M27x2 rod thread, and a magnetic piston for CS1-B/DS1-B sensors. AirTAC replaced this legacy unit with the SAI125X260S.
The SAI125X260S is a direct replacement matching the exact ISO 15552 mounting interface, bore, output force, and port size. It upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life.
Airtac SI125 Standard Cylinder SI125X260S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X260S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X260S |
| 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 SAI125X260S 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 SAI125X260S 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 SI125X260S
| 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 SI125X260S Is Used
Heavy Press Operations
Drives robust clamping and stamping fixtures requiring up to 11045 N of thrust at 0.9 MPa for high-force metal forming.
Pallet Lift Stations
Lifts heavy loads vertically with a 313 kg safe capacity at 0.5 MPa, ideal for materials handling and automated distribution lines.
Large Mold Actuation
Actuates substantial injection molds or heavy tooling platforms where the 125 mm bore and 260 mm stroke provide necessary displacement.
Replacing the Airtac SI125 Standard Cylinder SI125X260S with the SAI125X260S
To replace the SI125X260S, order the SAI125X260S ensuring the ISO 15552 mounting interface, 125 mm bore, 260 mm stroke, G1/2 port, and magnet option match your fixture. The SAI family also introduces the SAIL air-released lock and BSAI clamp-lock variants absent from the SI line. A plain SAI cylinder will not hold a load without live air; the 40 mm adjustable cushions only decelerate near stroke ends, so use an external rod lock or pilot check valve for secure holding. Since the 260 mm stroke is below the 300 mm threshold, side-load rod-bending risks are minimal, but standard guide precautions apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X260S
- ✓ 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 SI125X260S FAQ
Yes, the SI125X260S is discontinued. The direct replacement is the SAI125X260S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 260 mm stroke, output force, and G1/2 port, fitting seamlessly into existing setups while upgrading the piston seal.
This 125 mm bore cylinder features a G1/2 air port. The thrust 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, and a theoretical maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X260S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X260S replacement — usually within 7-8 hours.