This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X570, 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 SI40X570
The AirTAC Airtac SI40 Standard Cylinder SI40X570 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 570mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X570, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke570 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X570
- 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 SI40X570
The AirTAC SI40X570 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 570mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X570, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories.
The SAI replacement features an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the SAI family introduces SAIL lock and BSAI clamp-lock variants the original SI lacked. Note this specific SKU lacks a magnet and cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X570 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X570 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X570 |
| Bore size | Ø40 mm |
| Stroke | 570 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 SAI40X570 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 SAI40X570 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 SI40X570
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×570 | 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 SI40X570 Is Used
Package Diversion
Drives routing gates on packaging lines where the 628N push force at 0.5MPa easily deflects standard cartons.
Pallet Stops
Actuates end-stop mechanisms on low-friction roller conveyors, handling vertical lift loads up to 32kg.
Replacing the Airtac SI40 Standard Cylinder SI40X570 with the SAI40X570
To replace the SI40X570, order the SAI40X570 direct equivalent, confirming the ISO 15552 interface, 40mm bore, 570mm stroke, G1/4 port (PT/G/NPT thread options) and mounting accessory. Because this SKU lacks the -S magnet suffix, it cannot support position sensing; if switches are needed, select an SAI40X570S. For sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore provides 982N. Plain cylinders drift on air loss—the cushion only decelerates near stroke end—so for secure holding use an external pilot check valve or the SAIL/BSAI lock variant. At 570mm, the stroke demands external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X570
- ✓ 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 SI40X570 FAQ
Yes, the SI40X570 is discontinued. The direct replacement is the AirTAC SAI40X570. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 570mm stroke, G1/4 port and mounting interface.
This double-acting cylinder uses a G1/4 air port. At 0.5MPa it provides 628N push and 528N pull force. Push force rises to 879N at 0.7MPa and 1130N at 0.9MPa, with a theoretical maximum of 128kgf at 1.0MPa.
Request a Quote for the SAI40X570
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X570 replacement — usually within 7-8 hours.