This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X575S, 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 SI40X575S
The AirTAC SI40 Standard Cylinder SI40X575S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 575mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X575S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke575 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X575S
- 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 SI40X575S
The AirTAC SI40X575S is a discontinued double-acting ISO 15552 profile cylinder. Delivering 628 N push force at 0.5 MPa through a 40 mm bore and 575 mm stroke, it is replaced by the SAI40X575S. This direct successor shares the exact ISO 15552 mounting interface, G1/4 port, and output force, fitting existing fixtures seamlessly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X575S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X575S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X575S |
| Bore size | Ø40 mm |
| Stroke | 575 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 SAI40X575S 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 SAI40X575S 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 SI40X575S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×575 | 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 SI40X575S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with 575 mm travel, utilizing the 628 N push force at 0.5 MPa to overcome guide friction.
Component Ejection
Ejects machined parts from a fixture over a 575 mm distance, relying on adjustable 27 mm air cushions to decelerate the payload smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40X575S with the SAI40X575S
To replace the SI40X575S, order the SAI40X575S, confirming the ISO 15552 interface, 40 mm bore, 575 mm stroke, G1/4 port, and mounting accessory. The -S magnet equates to legacy CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. For sizing, a 50 mm bore offers 982 N push at 0.5 MPa, whereas a 32 mm bore provides 402 N. Note that a 575 mm stroke invites rod bending under side-loads, so use external guides to prevent premature seal wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X575S
- ✓ 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 SI40X575S FAQ
Yes, the SI40X575S is discontinued. The direct replacement is the SAI40X575S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 575 mm stroke, G1/4 port, and output force, dropping straight into existing machinery.
At 0.5 MPa, push force is 628 N and pull is 528 N. At 0.7 MPa push is 879 N, and 1130 N at 0.9 MPa. The theoretical max is 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a G1/4 port and M12x1.25 rod thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X575S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X575S replacement — usually within 7-8 hours.