This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX230S, 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 SI125BX230S
The AirTAC SI125 Standard Cylinder SI125BX230S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 230mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX230S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke230 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX230S
- 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 SI125BX230S
The AirTAC SI125BX230S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 230 mm stroke. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125BX230S. This direct successor shares the exact ISO 15552 mounting interface, G1/2 port, and stroke, fitting existing fixtures seamlessly.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific unit includes a SUS304 stainless rod (-B) and a magnet (-S) for CS1-B/DS1-B switches. For load holding, note that air cushions only decelerate; use an external rod lock or pilot check valve, as the plain cylinder drifts without air.
Airtac SI125 Standard Cylinder SI125BX230S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX230S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX230S |
| Bore size | Ø125 mm |
| Stroke | 230 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 SAI125BX230S 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 SAI125BX230S 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 SI125BX230S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×230 | 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 SI125BX230S Is Used
Heavy-Duty Pressing
Ideal for applying high clamping forces in automated assembly lines, utilizing the 6136 N push force at 0.5 MPa to seat heavy components firmly.
Stainless Washdown
The SUS304 piston rod (-B option) excels in corrosive or washdown environments, ensuring reliable actuation in food processing or chemical plants.
Replacing the Airtac SI125 Standard Cylinder SI125BX230S with the SAI125BX230S
To replace the SI125BX230S, order the SAI125BX230S. Confirm the ISO 15552 mounting interface, 125 mm bore, 230 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. This unit has a SUS304 stainless rod (-B) and magnet (-S); the SAI uses current AirTAC switches instead of legacy CS1-B/DS1-B. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. With 230 mm stroke, ensure adequate guide support to prevent rod-bending side loads. For held loads, use an external rod lock or pilot check valve, or explore SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX230S
- ✓ 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 SI125BX230S FAQ
Yes, the SI125BX230S is discontinued. The direct replacement is the SAI125BX230S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 230 mm stroke, output force, and G1/2 port, fitting directly into your existing fixtures.
This 125 mm bore cylinder has a G1/2 air port. Theoretical forces 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 maximum force of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX230S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX230S replacement — usually within 7-8 hours.