This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX225, 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 SI125BX225
The AirTAC SI125 Standard Cylinder SI125BX225 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX225, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX225
- 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 SI125BX225
The AirTAC SI125BX225 is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore, 225 mm stroke, and a SUS304 stainless steel piston rod. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125BX225 direct equivalent. This upgrade shares the same G1/2 port, M27x2 thread, and mounting interface, fitting existing fixtures perfectly.
The SAI125BX225 introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this SKU lacks a magnet and cannot accept position sensors.
Airtac SI125 Standard Cylinder SI125BX225 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX225 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX225 |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAI125BX225 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 SAI125BX225 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 SI125BX225
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SI125BX225 Is Used
Heavy Stamp Pressing
Ideal for driving heavy stamping dies requiring 6136 N push force at 0.5 MPa, utilizing the robust 32 mm SUS304 rod.
Corrosive Material Clamping
The SUS304 stainless rod option excels in humid or washdown clamping applications where carbon steel would corrode.
Replacing the Airtac SI125 Standard Cylinder SI125BX225 with the SAI125BX225
To replace the discontinued SI125BX225, order the SAI125BX225. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), bore, 225 mm stroke, G1/2 port, and the SUS304 stainless rod requirement. Since this non-magnetic SKU cannot take CS1-B/DS1-B sensors, add external sensing if needed. The 125 mm bore yields 6136 N push at 0.5 MPa; if undersizing, an 80 mm bore gives 2513 N. For load holding on air loss, the standard cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variants. With a 225 mm stroke, rod-bending side loads are moderate, but ensure adequate guiding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX225
- ✓ 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 SI125BX225 FAQ
Yes, the SI125BX225 is discontinued. The direct replacement is the SAI125BX225. It matches the ISO 15552 mounting interface, 125 mm bore, 225 mm stroke, force, G1/2 port, and accessories perfectly.
It features a G1/2 port. Force ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX225
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX225 replacement — usually within 7-8 hours.