This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X572SN, 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 SI40X572SN
The AirTAC Airtac SI40 Standard Cylinder SI40X572SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 572mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X572SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke572 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X572SN
- 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 SI40X572SN
The AirTAC SI40X572SN is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 572 mm stroke. Delivering 628 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI40X572SN. This direct successor matches the exact mounting interface, bore, stroke, output force and port size, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI unit includes a -S magnet for CS1-B/DS1-B switches and an -N NBR seal (-20 to +70 C; Viton H raises this to 150 C).
Airtac SI40 Standard Cylinder SI40X572SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X572SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X572SN |
| Bore size | Ø40 mm |
| Stroke | 572 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 SAI40X572SN 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 SAI40X572SN 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 SI40X572SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×572 | 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 SI40X572SN Is Used
Package Diversion
Drives sorting pop-up arms on packaging lines, utilizing the 628 N push force to deflect cartons at high throughput speeds.
Component Ejection
Ejects machined parts from fixtures over a 572 mm reach, requiring external guide rails to prevent rod bending during extension.
Replacing the Airtac SI40 Standard Cylinder SI40X572SN with the SAI40X572SN
To replace the SI40X572SN, order the SAI40X572SN. Confirm the ISO 15552 mounting interface, 40 mm bore, 572 mm stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while the -N denotes the NBR seal. Sizing both ways: a 32 mm bore offers 402 N push @0.5 MPa, whereas a 50 mm bore yields 982 N. For this 572 mm stroke, use external guides 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 variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X572SN
- ✓ 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 SI40X572SN FAQ
Yes, the SI40X572SN is discontinued. The direct replacement is the SAI40X572SN. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 572 mm stroke, force, G1/4 port, and mounting interface to fit existing setups directly.
This double-acting cylinder features a G1/4 port and delivers 628 N push / 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 with a 27 mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X572SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X572SN replacement — usually within 7-8 hours.