This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX450S, 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 SI40AX450S
The AirTAC Airtac SI40 Standard Cylinder SI40AX450S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX450S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX450S
- 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 SI40AX450S
The AirTAC SI40AX450S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 450mm stroke, G1/4 port, and an SUS420J2 stainless steel rod. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40AX450S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, and port, fitting existing fixtures perfectly while using an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S magnet supports legacy CS1-B/DS1-B sensors, and a Viton H seal option raises operating temperature to 150 C.
Airtac SI40 Standard Cylinder SI40AX450S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX450S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX450S |
| Bore size | Ø40 mm |
| Stroke | 450 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 SAI40AX450S 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 SAI40AX450S 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 SI40AX450S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SI40AX450S Is Used
Diverting Mechanisms
Drives routing gates on packaging lines using its 628 N push force and 450 mm travel to redirect products smoothly.
Vertical Material Lift
Elevates tote boxes up to 32 kg in pick modules, relying on the stainless SUS420J2 rod for corrosion resistance.
Replacing the Airtac SI40 Standard Cylinder SI40AX450S with the SAI40AX450S
To replace the SI40AX450S, order the SAI40AX450S. Confirm the ISO 15552 mounting interface, 40mm bore, 450mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet enables current AirTAC switches (legacy used CS1-B/DS1-B), and the -A rod is SUS420J2 stainless. Sizing both ways: a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. For loads needing holding on air loss, a plain cylinder drifts (cushions only decelerate), so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 450mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX450S
- ✓ 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 SI40AX450S FAQ
Yes, the SI40AX450S is discontinued. The direct replacement is the SAI40AX450S, which shares the same ISO 15552 mounting interface, 40mm bore, 450mm stroke, 628 N force, and G1/4 port.
It features a G1/4 port and M12x1.25 rod thread. Force ratings are: 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 maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX450S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX450S replacement — usually within 7-8 hours.