This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X430S, 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 SI40X430S
The AirTAC Airtac SI40 Standard Cylinder SI40X430S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 430mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X430S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke430 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X430S
- 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 SI40X430S
The AirTAC SI40X430S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 430 mm stroke. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40X430S, which shares the exact ISO 15552 mounting interface, bore, stroke, output force and accessories.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SI-S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF and BSAI variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X430S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X430S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X430S |
| Bore size | Ø40 mm |
| Stroke | 430 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 SAI40X430S 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 SAI40X430S 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 SI40X430S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×430 | 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 SI40X430S Is Used
Package Diverting
Drives diverter arms on packaging lines, using the 430 mm stroke to push cartons cleanly between adjacent conveyor belts.
Pallet Push-Off
Acts as a low-profile pusher to slide goods off roller conveyors, relying on the 628 N push force at 0.5 MPa for steady transfers.
Material Lowering
Lowers light fixtures or trays along a guided vertical path, where the 32 kg safe vertical lift capacity handles the descent safely.
Replacing the Airtac SI40 Standard Cylinder SI40X430S with the SAI40X430S
To replace the SI40X430S, order the SAI40X430S. Confirm the ISO 15552 mounting interface, the 40 mm bore, 430 mm stroke, G1/4 port (PT/G/NPT threads) and your mounting accessory. The -S magnet on your original used CS1-B/DS1-B switches; the SAI replacement uses current AirTAC sensors. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. If you need to hold the load without live air, the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 430 mm stroke is long, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X430S
- ✓ 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 SI40X430S FAQ
Yes, the SI40X430S is discontinued. The direct replacement is the AirTAC SAI40X430S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 430 mm stroke, G1/4 port and mounting hardware for a seamless fixture swap.
The bore is 40 mm with a G1/4 air port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X430S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X430S replacement — usually within 7-8 hours.