This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X40CB, 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 SI125X40CB
The AirTAC Airtac SI125 Standard Cylinder SI125X40CB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 40mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X40CB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X40CB
- 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 SI125X40CB
The AirTAC SI125X40CB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 40 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X40CB, which shares the exact CB clevis mounting, M27x2 rod thread, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X40CB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X40CB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X40CB |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAI125X40CB 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 SAI125X40CB 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 SI125X40CB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SI125X40CB Is Used
Heavy Press Clamping
Applies 6136 N of clamping thrust at 0.5 MPa to secure heavy steel plates during machining or welding operations.
Pallet Stopper Gate
Acts as a robust 125 mm bore stopper gate in high-mass conveyor lines, utilizing the CB clevis to absorb pivot stress.
Injection Mold Eject
Provides a short 40 mm stroke ejection push for thick-walled industrial molded components, handling high initial resistance.
Replacing the Airtac SI125 Standard Cylinder SI125X40CB with the SAI125X40CB
To replace the SI125X40CB, order the SAI125X40CB. Confirm the ISO 15552 CB clevis interface, 125 mm bore, 40 mm stroke, and G1/2 port. Because this SKU has no -S magnet, it cannot support position sensing; if switches are needed, specify a magnet on the new SAI. The 125 mm bore yields 6136 N push at 0.5 MPa; sizing down to 100 mm drops this to 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X40CB
- ✓ 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 SI125X40CB FAQ
Yes, the AirTAC SI125X40CB is discontinued. The direct replacement is the SAI125X40CB. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 40 mm stroke, G1/2 port, and CB clevis mounting.
The 125 mm bore uses a G1/2 port. It generates 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 SAI125X40CB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X40CB replacement — usually within 7-8 hours.