This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X585S, 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 SI40X585S
The AirTAC Airtac SI40 Standard Cylinder SI40X585S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 585mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X585S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke585 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X585S
- 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 SI40X585S
The AirTAC SI40X585S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 585 mm stroke. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40X585S. This direct successor matches the G1/4 port, M12x1.25 rod thread and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. It adds SAIL, SAIF and BSAI variants the SI lacked. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X585S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X585S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X585S |
| Bore size | Ø40 mm |
| Stroke | 585 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 SAI40X585S 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 SAI40X585S 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 SI40X585S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×585 | 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 SI40X585S Is Used
Material Diversion
Actuates routing gates on packaging lines, using the 628 N push force at 0.5 MPa to shift products between conveyors.
Storage Retrieval
Extends 585 mm to push totes from shelving racks, requiring external guides to prevent rod bending over the long stroke.
Replacing the Airtac SI40 Standard Cylinder SI40X585S with the SAI40X585S
To replace the SI40X585S, order the SAI40X585S. Verify the ISO 15552 interface, 40 mm bore, 585 mm stroke, G1/4 port and magnet. If you need more force, the 50 mm bore offers 982 N push at 0.5 MPa. For less, the 32 mm bore gives 402 N. At 585 mm, prevent rod bending by using an external guide. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X585S
- ✓ 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 SI40X585S FAQ
Yes, the SI40X585S is discontinued. The direct replacement is the SAI40X585S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 585 mm stroke, G1/4 port and mounting interface.
The bore is 40 mm with a G1/4 air port. Force output is 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 theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X585S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X585S replacement — usually within 7-8 hours.