This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X590S, 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 SI40X590S
The AirTAC SI40 Standard Cylinder SI40X590S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 590mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X590S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke590 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X590S
- 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 SI40X590S
The AirTAC SI40X590S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40 mm bore, 590 mm stroke, G1/4 port, and 628 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40X590S, a direct upgrade retaining the exact interface, output, and dimensions.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For applications needing load holding, the new SAIL or BSAI lock variants solve what the plain SI could not.
Airtac SI40 Standard Cylinder SI40X590S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X590S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X590S |
| Bore size | Ø40 mm |
| Stroke | 590 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 SAI40X590S 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 SAI40X590S 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 SI40X590S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×590 | 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 SI40X590S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 590 mm reach, utilizing the 628 N thrust at 0.5 MPa for reliable routing.
Pallet Handling
Actuates stop gates and positioning stops in pallet flow systems, taking advantage of the ISO 15552 mounting compatibility.
Replacing the Airtac SI40 Standard Cylinder SI40X590S with the SAI40X590S
To replace the SI40X590S, order the SAI40X590S, confirming the ISO 15552 mounting interface, 40 mm bore, 590 mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B sensors. If you need more force, the 50 mm bore yields 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. Because this is a 590 mm stroke, use external guides to prevent rod bending and side-load damage. The air cushion only decelerates the piston near stroke end; for dead-load holding on air loss, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X590S
- ✓ 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 SI40X590S FAQ
Yes, the SI40X590S is discontinued. The direct replacement is the SAI40X590S. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 590 mm stroke, G1/4 port, and mounting fixtures.
The G1/4 port bore 40 mm cylinder delivers 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. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X590S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X590S replacement — usually within 7-8 hours.