This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX580S, 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 SI40BX580S
The AirTAC Airtac SI40 Standard Cylinder SI40BX580S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 580mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX580S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke580 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX580S
- 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 SI40BX580S
The AirTAC SI40BX580S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 580mm stroke, G1/4 port, and a SUS304 stainless steel rod. Delivering 628N push at 0.5MPa, its direct replacement is the SAI40BX580S, which shares the exact same interface, force, and mounting.
The SAI upgrade features a new piston seal (two Y-shaped one-way elements) for low start-up pressure and long life. The -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 SI40BX580S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX580S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX580S |
| Bore size | Ø40 mm |
| Stroke | 580 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 SAI40BX580S 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 SAI40BX580S 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 SI40BX580S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×580 | 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 SI40BX580S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 580mm stroke, relying on the SUS304 rod for washdown corrosion resistance.
Stainless Material Handling
Actuates gates in humid storage areas, using the 628N push force and SUS304 rod to resist environmental corrosion.
Replacing the Airtac SI40 Standard Cylinder SI40BX580S with the SAI40BX580S
To replace the SI40BX580S, order the SAI40BX580S, confirming the ISO 15552 mounting interface, 40mm bore, 580mm stroke, G1/4 port, and SUS304 rod. For sizing, neighbouring bores are 32mm (402N push) and 50mm (982N push) at 0.5MPa. Because the 580mm stroke is long, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The -S magnet fits CS1-B/DS1-B switches; the SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX580S
- ✓ 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 SI40BX580S FAQ
Yes, the SI40BX580S is discontinued. The direct replacement is the SAI40BX580S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 580mm stroke, 628N force, G1/4 port, and SUS304 rod.
The G1/4 port bore delivers a push of 628N and pull of 528N at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a max force of 128kgf at 1.0MPa. The cushion only decelerates; it does not hold the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX580S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX580S replacement — usually within 7-8 hours.