This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX230, 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 SI125BX230
The AirTAC SI125 Standard Cylinder SI125BX230 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 SAI125BX230, 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 → SAI125BX230
- 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 SI125BX230
The AirTAC SI125BX230 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 230 mm stroke, and SUS304 stainless steel piston rod. It delivers 6136 N push and 5734 N pull at 0.5 MPa, utilizing a G1/2 port and M27x2 rod thread. The direct replacement is the SAI125BX230, which maintains the exact ISO 15552 mounting interface, force, and port size for existing fixtures.
The SAI upgrade features a revised 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. For load-holding needs, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI125 Standard Cylinder SI125BX230 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX230 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX230 |
| 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 SAI125BX230 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 SAI125BX230 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 SI125BX230
| 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 SI125BX230 Is Used
Heavy Press Clamping
Secures large metal workpieces in machining centers, using the 6136 N push force at 0.5 MPa to hold components firmly during high-stress milling operations.
Pallet Lift Gates
Drives heavy loading dock gates where the SUS304 stainless rod resists moisture corrosion, and the 230 mm stroke provides the precise travel needed for latch alignment.
Mold Ejection Systems
Ejects dense composite molds from presses, benefiting from the robust 125 mm bore profile and adjustable 40 mm cushions to safely decelerate heavy masses at stroke end.
Replacing the Airtac SI125 Standard Cylinder SI125BX230 with the SAI125BX230
To replace the discontinued SI125BX230, order the SAI125BX230. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 230 mm stroke, G1/2 port, and M27x2 thread. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is required. If sizing alternatives, neighboring bores offer different force classes, but at 0.5 MPa this 125 mm bore provides 6136 N push. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. For any stroke over 300 mm, guide the load to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX230
- ✓ 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 SI125BX230 FAQ
Yes, the AirTAC SI125BX230 is discontinued. The direct replacement is the SAI125BX230. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 230 mm stroke, G1/2 port, and mounting interface, so it drops directly into existing fixtures.
This double-acting cylinder features a G1/2 port and generates 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa it pushes 8590 N, and 11045 N at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX230
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX230 replacement — usually within 7-8 hours.