This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX230S, 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 SI40AX230S
The AirTAC Airtac SI40 Standard Cylinder SI40AX230S 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 SAI40AX230S, 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 → SAI40AX230S
- 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 SI40AX230S
The AirTAC SI40AX230S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 230mm stroke, and a SUS420J2 stainless piston rod. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX230S, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI40 Standard Cylinder SI40AX230S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX230S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX230S |
| 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 SAI40AX230S 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 SAI40AX230S 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 SI40AX230S
| 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 SI40AX230S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for mid-force (628N) positioning in environments where standard carbon steel rods face corrosion risks.
230mm Stroke Diverting
Provides the extended reach needed to push or redirect packages between handling lanes using a 40mm bore profile cylinder.
Replacing the Airtac SI40 Standard Cylinder SI40AX230S with the SAI40AX230S
To replace the SI40AX230S, order the SAI40AX230S. Confirm the ISO 15552 mounting interface, 40mm bore, 230mm stroke, G1/4 port, and mounting accessory. The -A rod is SUS420J2 stainless, and the -S magnet takes legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. At 230mm, ensure guide alignment to prevent rod bending. The cushion only decelerates; it does not hold load on air loss, so use an external rod lock or the SAIL/BSAI lock variant for holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX230S
- ✓ 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 SI40AX230S FAQ
Yes, the SI40AX230S is discontinued. The direct replacement is the SAI40AX230S. It features the same ISO 15552 mounting interface, 40mm bore, 230mm stroke, output force, G1/4 port, and SUS420J2 stainless rod, fitting existing fixtures perfectly.
The 40mm bore uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, at 0.9MPa it is 1130N, and the theoretical maximum force is 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX230S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX230S replacement — usually within 7-8 hours.