This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX475S, 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 SI40AX475S
The AirTAC SI40 Standard Cylinder SI40AX475S 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 SAI40AX475S, 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 → SAI40AX475S
- 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 SI40AX475S
The AirTAC SI40AX475S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 475mm stroke. Featuring a SUS420J2 stainless steel rod and a built-in magnet for CS1-B/DS1-B sensors, it delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX475S, matching the interface, force, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while the SAI family adds SAIL, SAIF, and BSAI lock variants. Note that plain cylinders drift without live air; use an external rod lock for holding.
Airtac SI40 Standard Cylinder SI40AX475S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX475S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX475S |
| 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 SAI40AX475S 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 SAI40AX475S 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 SI40AX475S
| 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 SI40AX475S Is Used
Diverting Gates
Actuates routing flaps on packaging lines, utilizing the 475mm stroke to shift products between parallel conveyors smoothly.
Stainless Rod Tooling
Drives light-duty clamping or marking tools in humid wash-down areas using the SUS420J2 corrosion-resistant piston rod.
Replacing the Airtac SI40 Standard Cylinder SI40AX475S with the SAI40AX475S
To replace the SI40AX475S, order the SAI40AX475S. It drops into existing ISO 15552 fixtures with identical 40mm bore, 475mm stroke, G1/4 port, M12x1.25 thread, and mounting accessories. Retain the -S magnet option for current AirTAC switches, and the -A SUS420J2 stainless rod for corrosion resistance. Operating speed is 30-800 mm/s. If you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is needed, the 32mm bore provides 402N. Because the 475mm stroke is long, prevent rod bending by using external guides to manage side loads. For load holding on air loss, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX475S
- ✓ 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 SI40AX475S FAQ
Yes, the SI40AX475S is discontinued. The direct replacement is the SAI40AX475S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 475mm stroke, G1/4 port, and mounting interface, but features an upgraded two Y-shaped one-way piston seal.
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 it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX475S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX475S replacement — usually within 7-8 hours.