This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150S, 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 SI125X150S
The AirTAC SI125 Standard Cylinder SI125X150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X150S
- 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 SI125X150S
The AirTAC SI125X150S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 150 mm stroke. Delivering 6136 N push force at 0.5 MPa via a G1/2 port, it is replaced by the direct replacement SAI125X150S. This upgrade shares identical ISO 15552 mounting dimensions, bore, and output force, fitting existing fixtures perfectly.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The family also introduces SAIL and BSAI lock variants the SI lacked. Your -S suffix means a built-in magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X150S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150S |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAI125X150S 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 SAI125X150S 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 SI125X150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SI125X150S Is Used
Heavy Stamping Press
Drives large tonnage stamping and forming dies requiring robust 125 mm bore force and stable 150 mm travel.
Pallet Lift Station
Actuates heavy load lifts in automated distribution hubs, utilizing the 6136 N push capacity at 0.5 MPa.
Injection Mould Clamp
Secures large moulding tools and heavy industrial platens, benefiting from the 40 mm adjustable end cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X150S with the SAI125X150S
To replace the SI125X150S, order the SAI125X150S. Verify the ISO 15552 interface, 150 mm stroke, G1/2 port, M27x2 rod thread, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet allows position sensing; note that legacy CS1-B/DS1-B switches are superseded by current AirTAC sensors on the SAI. If sizing alternatives, the neighbouring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. Remember, a plain cylinder drifts without live air—the cushion only decelerates. For load holding on air loss, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150S
- ✓ 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 SI125X150S FAQ
Yes, the SI125X150S is discontinued. The direct replacement is the SAI125X150S. It shares the same ISO 15552 mounting interface, 125 mm bore, 150 mm stroke, output force, and G1/2 port, dropping directly into existing machinery.
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed for this 125 mm bore is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150S replacement — usually within 7-8 hours.