This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X660S, 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 SI125X660S
The AirTAC SI125 Standard Cylinder SI125X660S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 660mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X660S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke660 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X660S
- 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 SI125X660S
The AirTAC SI125X660S is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 660mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a G1/2 port, M27x2 rod thread, and a piston magnet for CS1-B/DS1-B sensors. AirTAC replaced this EOL unit with the SAI125X660S.
The SAI125X660S is a direct replacement retaining the exact ISO 15552 mounting interface, bore, and force. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. The SAI family also adds SAIL lock and BSAI clamp-lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X660S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X660S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X660S |
| Bore size | Ø125 mm |
| Stroke | 660 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 SAI125X660S 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 SAI125X660S 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 SI125X660S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×660 | 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 SI125X660S Is Used
Heavy Press Ejection
Provides the 6136 N push force needed to eject dense stamped parts from heavy machinery, with the 660mm stroke clearing deep press beds.
Pallet Diversion
Actuates large-scale pallet stops and diverter arms on high-mass conveyor lines where a 313 kg vertical lift margin handles substantial product weights.
Automated Lift Gates
Drives heavy loading-dock gates or industrial scissor lifts, requiring external guides to manage side-load over the extended 660mm travel.
Replacing the Airtac SI125 Standard Cylinder SI125X660S with the SAI125X660S
To replace the SI125X660S, order the SAI125X660S direct, confirming the ISO 15552 interface, 125mm bore, 660mm stroke, G1/2 port, and -S magnet for current AirTAC switches. If you need more force, the 160mm bore offers 10053 N push at 0.5 MPa; if less is required, the 100mm bore provides 3927 N. Note that a 660mm stroke demands external guides to prevent rod bending under side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X660S
- ✓ 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 SI125X660S FAQ
Yes, the SI125X660S is discontinued. The direct replacement is the SAI125X660S. It shares the identical ISO 15552 mounting interface, 125mm bore, 660mm stroke, G1/2 port, and force ratings, fitting existing fixtures perfectly while upgrading the piston seal.
The 125mm bore features a G1/2 air port. It generates 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X660S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X660S replacement — usually within 7-8 hours.