This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X580S, 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 SI40X580S
The AirTAC Airtac SI40 Standard Cylinder SI40X580S 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 SAI40X580S, 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 → SAI40X580S
- 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 SI40X580S
The AirTAC SI40X580S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 580mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X580S, a direct sharing the exact interface, bore, stroke, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. This -S model uses a piston magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X580S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X580S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X580S |
| 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 SAI40X580S 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 SAI40X580S 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 SI40X580S
| 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 SI40X580S Is Used
Long-Stroke Diverting
Pushes packages across a transfer lane with 580mm travel, relying on the 628 N push force to overcome friction.
Component Ejection
Clears machined parts from a fixture over an extended distance, using adjustable cushions to stop smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40X580S with the SAI40X580S
To replace this SI40X580S, order the SAI40X580S and confirm the ISO 15552 mounting interface, 40mm bore, 580mm stroke, G1/4 port (PT/G/NPT), and your mounting accessory. Because this is a 580mm stroke, use external guides to prevent rod bending and side-load wear. If you need more force, the neighbouring 50mm bore yields 982 N push at 0.5 MPa; if less is acceptable, the 32mm bore gives 402 N. A plain cylinder drifts 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.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X580S
- ✓ 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 SI40X580S FAQ
Yes, the SI40X580S is discontinued. The direct replacement is the SAI40X580S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 580mm stroke, 628 N force, G1/4 port, and mounting fixtures.
The 40mm bore uses a G1/4 port. Force outputs 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 theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X580S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X580S replacement — usually within 7-8 hours.