This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150CB, 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 SI125X150CB
The AirTAC SI125 Standard Cylinder SI125X150CB 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 SAI125X150CB, 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 → SAI125X150CB
- 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 SI125X150CB
The AirTAC SI125X150CB is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa. It features a 125 mm bore, 150 mm stroke, and a CB clevis mount. The direct replacement is the SAI125X150CB, retaining the exact G1/2 port, M27x2 rod thread, and 40 mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnetic SKU cannot take a sensor, and plain cylinders drift without air; explore SAIL or BSAI lock variants for holding.
Airtac SI125 Standard Cylinder SI125X150CB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150CB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150CB |
| 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 SAI125X150CB 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 SAI125X150CB 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 SI125X150CB
| 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 SI125X150CB Is Used
Heavy Stamp Press Feed
Drives robust 313 kg vertical lift tooling in stamping presses, utilizing the 6136 N thrust at 0.5 MPa to move heavy billets reliably.
Automated Welding Clamp
Holds large structural frames in robotic welding cells, where the 125 mm bore and CB clevis mount absorb high shock loads during fabrication.
Pallet Stopper Gate
Acts as a heavy-duty stopper arm in high-mass conveyor lines, using its 11045 N output at 0.9 MPa to halt fully loaded pallets securely.
Replacing the Airtac SI125 Standard Cylinder SI125X150CB with the SAI125X150CB
To replace the SI125X150CB, order the SAI125X150CB and confirm the ISO 15552 CB clevis mounting interface, 125 mm bore, 150 mm stroke, and G1/2 port. This non-magnetic version cannot accept a CS1-B or DS1-B sensor, so if position detection is needed, switch to an -S magnet SKU. Sizing both ways: a 100 mm bore yields 3927 N at 0.5 MPa, while a 160 mm bore yields 10053 N. Remember that a standard cylinder does not hold load on air loss—the cushion only decelerates. For load holding, consider the SAIL or BSAI lock variants, or an external pilot check valve. For this 150 mm stroke, ensure guide alignment to prevent rod bending side-loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150CB
- ✓ 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 SI125X150CB FAQ
Yes, the SI125X150CB is discontinued. The direct replacement is the SAI125X150CB. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the same 125 mm bore, 150 mm stroke, force, G1/2 port, and CB clevis mount.
This 125 mm bore cylinder uses 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 at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150CB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150CB replacement — usually within 7-8 hours.