This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX475, 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 SI40AX475
The AirTAC Airtac SI40 Standard Cylinder SI40AX475 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 475mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX475, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke475 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX475
- 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 SI40AX475
The AirTAC SI40AX475 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 475mm stroke. Delivering 628N push force at 0.5MPa through a G1/4 port, it is replaced by the SAI40AX475. This direct successor matches the exact interface, bore, stroke, force and mounting hardware.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU uses a SUS420J2 stainless rod (A suffix) but lacks a magnet, so it cannot take a CS1-B/DS1-B sensor.
Airtac SI40 Standard Cylinder SI40AX475 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX475 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX475 |
| Bore size | Ø40 mm |
| Stroke | 475 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 SAI40AX475 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 SAI40AX475 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 SI40AX475
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×475 | 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 SI40AX475 Is Used
Diverting Gate Actuation
Drives routing flaps on packaging lines where the 628N push force at 0.5MPa easily overcomes flap friction and product deflection.
Stainless Rod Tooling
Operates light-duty machining clamps in humid environments using the SUS420J2 rod option to resist corrosion over the 475mm travel.
Replacing the Airtac SI40 Standard Cylinder SI40AX475 with the SAI40AX475
To replace the SI40AX475, order the SAI40AX475, confirming the ISO 15552 mounting interface, 40mm bore, 475mm stroke, G1/4 port, and SUS420J2 stainless rod. Because this is a no-magnet SKU, it cannot accept position sensors. If you need to downsize, a 32mm bore yields 402N push at 0.5MPa; if you need more force, a 50mm bore yields 982N. A plain cylinder does not hold load on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. With the 475mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX475
- ✓ 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 SI40AX475 FAQ
Yes, the AirTAC SI40AX475 is discontinued. The direct replacement is the SAI40AX475. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 475mm stroke, 628N force, G1/4 port, and mounting interface.
The bore is 40mm with a G1/4 air port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa push is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX475
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX475 replacement — usually within 7-8 hours.