This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X350SCB, 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 SI125X350SCB
The AirTAC SI125 Standard Cylinder SI125X350SCB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X350SCB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X350SCB
- 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 SI125X350SCB
The AirTAC SI125X350SCB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 350 mm stroke. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125X350SCB. This direct upgrade matches the exact bore, stroke, G1/2 port, and CB clevis mounting interface. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The SAI family adds SAIL and BSAI lock variants absent in the SI line. This unit includes a piston magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. A Viton H seal option raises the -20 to +70 C range to 150 C.
Airtac SI125 Standard Cylinder SI125X350SCB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X350SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X350SCB |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAI125X350SCB 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 SAI125X350SCB 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 SI125X350SCB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SI125X350SCB Is Used
Heavy Press Operations
Ideal for driving large stamping or forming presses where 6136 N of thrust at 0.5 MPa is required to shape metal components securely.
Large Gate Actuation
Suited for opening and closing heavy industrial bulkhead gates or diverters in material handling systems requiring a 350 mm travel distance.
Replacing the Airtac SI125 Standard Cylinder SI125X350SCB with the SAI125X350SCB
To replace the SI125X350SCB, order the SAI125X350SCB. Verify the ISO 15552 CB clevis mounting, 125 mm bore, 350 mm stroke, G1/2 port, and the -S magnet. The SAI is dimensionally interchangeable per ISO 15552. If downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore gives 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI variants. At 350 mm, prevent rod bending by using an external guide to handle side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X350SCB
- ✓ 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 SI125X350SCB FAQ
Yes, the SI125X350SCB is discontinued. The direct replacement is the SAI125X350SCB. It shares the identical ISO 15552 mounting interface, 125 mm bore, 350 mm stroke, output force, G1/2 port, and CB clevis mount, fitting existing fixtures perfectly.
This double-acting cylinder features a G1/2 air port. It delivers 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. The speed range is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X350SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X350SCB replacement — usually within 7-8 hours.