This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX150, 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 SI125BX150
The AirTAC SI125 Standard Cylinder SI125BX150 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 SAI125BX150, 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 → SAI125BX150
- 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 SI125BX150
The AirTAC SI125BX150 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 150 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. This specific SKU features a SUS304 stainless piston rod (-B) for corrosion resistance but lacks a magnet, meaning it cannot accept position sensors. The direct replacement is the SAI125BX150, sharing the same interface, force, and mounting.
Upgrading to the SAI125BX150 retains all ratings but introduces an upgraded piston seal with two Y-shaped elements for lower start-up pressure and longer life. Note that plain cylinders drift without live air; for load holding, explore the SAIL or BSAI lock variants the SI line lacked.
Airtac SI125 Standard Cylinder SI125BX150 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX150 |
| 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 SAI125BX150 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 SAI125BX150 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 SI125BX150
| 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 SI125BX150 Is Used
Heavy Press Clamping
Ideal for securing large metal components during machining, utilizing the 6136 N push force and SUS304 rod to withstand harsh coolant environments.
Robotic Material Transfer
Moves substantial workpieces between conveyor lines, relying on the 125 mm bore's 30-500 mm/s speed range and robust ISO 15552 mounting.
Replacing the Airtac SI125 Standard Cylinder SI125BX150 with the SAI125BX150
To replace the SI125BX150, order the SAI125BX150. Confirm the ISO 15552 mounting interface, 150 mm stroke, G1/2 port, and your specific mounting accessory (LB, FA, CA, TC). Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with a magnet. Sizing both ways: the 125 mm bore gives 6136 N push at 0.5 MPa (8590 N at 0.7 MPa), while the neighbouring 100 mm bore offers 3927 N at 0.5 MPa. Remember, the air cushion only decelerates; it does not hold load. For drop prevention, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX150
- ✓ 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 SI125BX150 FAQ
Yes, the AirTAC SI125BX150 is discontinued. The direct replacement is the SAI125BX150. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 150 mm stroke, G1/2 port, and mounting interface.
The bore is 125 mm with a G1/2 air port. Force output is 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 maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX150
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