This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX115S, 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 SI125BX115S
The AirTAC SI125 Standard Cylinder SI125BX115S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 115mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX115S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX115S
- 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 SI125BX115S
The AirTAC SI125BX115S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 115 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125BX115S, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SI125BX115S variant has a SUS304 stainless steel rod for corrosion resistance and a built-in magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125BX115S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX115S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX115S |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAI125BX115S 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 SAI125BX115S 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 SI125BX115S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SI125BX115S Is Used
Heavy Press Clamping
Applies 6136 N of thrust at 0.5 MPa to secure heavy metal components during machining or welding operations.
Pallet Load Shifting
Moves substantial weighted pallets along conveyors, utilising the 115 mm stroke to push loads firmly into staging lanes.
Robotic Material Handoff
Acts as a robust actuator in automated cells, using the SUS304 stainless rod to resist moisture in washdown adjacent zones.
Replacing the Airtac SI125 Standard Cylinder SI125BX115S with the SAI125BX115S
To replace the discontinued SI125BX115S, order the SAI125BX115S, confirming the ISO 15552 interface, 115 mm stroke, G1/2 port, and mounting accessory. This unit includes the -S magnet and -B SUS304 stainless rod. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N. Because the stroke is 115 mm, ensure adequate side-load support to prevent rod bending. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, or select the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX115S
- ✓ 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 SI125BX115S FAQ
Yes, the AirTAC SI125BX115S is discontinued. The direct replacement is the SAI125BX115S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 115 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
This double-acting cylinder features a G1/2 air port. The 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 maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX115S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX115S replacement — usually within 7-8 hours.