This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX230S, 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 SI40 Standard Cylinder SI40BX230S
The AirTAC Airtac SI40 Standard Cylinder SI40BX230S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX230S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX230S
- 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 SI40 Standard Cylinder SI40BX230S
The AirTAC SI40BX230S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 230mm stroke, and a SUS304 stainless steel rod. Delivering 628 N push force at 0.5 MPa, it is replaced by the direct replacement SAI40BX230S, which shares the exact bore, stroke, force, G1/4 port, and ISO 15552 mounting interface.
The SAI upgrade utilizes two Y-shaped one-way piston seals for low start-up pressure and long life. The included magnet works with legacy CS1-B/DS1-B sensors, while a Viton H seal option raises operating temperature to 150 C.
Airtac SI40 Standard Cylinder SI40BX230S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX230S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX230S |
| Bore size | Ø40 mm |
| Stroke | 230 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40BX230S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40BX230S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40BX230S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SI40 Standard Cylinder SI40BX230S Is Used
Stainless Rod Diverters
The SUS304 rod handles washdown environments while pushing 628 N at 0.5 MPa to divert packages on conveyor lines.
Corrosive Fluid Handling
Ideal for shifting dampers in chemical processing where the stainless rod prevents corrosion and Viton H seals handle 150 C heat.
Replacing the Airtac SI40 Standard Cylinder SI40BX230S with the SAI40BX230S
To replace the SI40BX230S, order the SAI40BX230S and confirm the ISO 15552 interface, 40mm bore, 230mm stroke, G1/4 port, and mounting accessory. The SUS304 rod resists corrosion, and the magnet enables current AirTAC switches. For sizing, a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variants. For 230mm strokes, ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX230S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40BX230S FAQ
Yes, the SI40BX230S is discontinued. The direct replacement is the SAI40BX230S, which maintains the same ISO 15552 mounting interface, 40mm bore, 230mm stroke, force, and G1/4 port.
The 40mm bore features a G1/4 port. It provides 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX230S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX230S replacement — usually within 7-8 hours.