This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX230, 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 SI40BX230
The AirTAC Airtac SI40 Standard Cylinder SI40BX230 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 SAI40BX230, 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 → SAI40BX230
- 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 SI40BX230
The AirTAC SI40BX230 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 230mm stroke. It delivers 628N push force at 0.5MPa. The direct replacement is the SAI40BX230, featuring the exact same interface, G1/4 port, and output force. The SAI upgrade utilizes an improved piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This specific SKU uses a SUS304 stainless steel rod for corrosion resistance, but lacks a magnet, meaning it cannot accept position switches.
Note that a standard cylinder does not hold load without live air; the 27mm adjustable cushions only decelerate near stroke ends. For load-holding, consider the SAIL or BSAI lock variants, or an external pilot check valve.
Airtac SI40 Standard Cylinder SI40BX230 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX230 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX230 |
| 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 SAI40BX230 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 SAI40BX230 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 SI40BX230
| 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 SI40BX230 Is Used
Stainless Rod Diverter
Ideal for diverting light packages on a washdown conveyor line, utilizing the SUS304 rod for corrosion resistance against moisture and cleaning agents.
Vertical Lift Gate
Provides reliable upward thrust for automated lift gates or access doors, handling loads safely within the 32kg vertical lift margin.
Light Press Ejector
Serves as an ejector for small stamped or molded parts, using the 230mm stroke to clear the work area completely before the next cycle.
Replacing the Airtac SI40 Standard Cylinder SI40BX230 with the SAI40BX230
To replace the discontinued SI40BX230, order the SAI40BX230. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 230mm stroke, and the G1/4 port. Because this SKU has no magnet (-S), it cannot support sensors; if position detection is needed, switch to an SAI40X230S model and use current AirTAC switches. Sizing both ways: if you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is acceptable, the 32mm bore provides 402N. For this 230mm stroke, ensure adequate guide support to prevent rod bending and side-load damage. If the application requires load holding on air loss, select the SAIL or BSAI lock variant instead of the standard cylinder.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX230
- ✓ 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 SI40BX230 FAQ
Yes, the SI40BX230 is discontinued. The direct replacement is the SAI40BX230. It is dimensionally interchangeable per ISO 15552, maintaining the same 40mm bore, 230mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures perfectly.
The 40mm bore double-acting cylinder operates at 30-800 mm/s. It generates 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa. The rod thread is M12x1.25.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX230
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX230 replacement — usually within 7-8 hours.