This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X524S, 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 SI40X524S
The AirTAC SI40 Standard Cylinder SI40X524S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 524mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X524S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke524 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X524S
- 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 SI40X524S
The AirTAC SI40X524S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 524mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X524S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The built-in magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X524S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X524S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X524S |
| Bore size | Ø40 mm |
| Stroke | 524 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 SAI40X524S 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 SAI40X524S 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 SI40X524S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×524 | 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 SI40X524S Is Used
Material Diversion
Pushes packages on a 524mm stroke line using 628N push force at 0.5MPa to actuate routing gates.
Pneumatic Ejection
Ejects machined parts from a fixture over a 524mm extension, requiring external guides to absorb side loads.
Replacing the Airtac SI40 Standard Cylinder SI40X524S with the SAI40X524S
To replace the SI40X524S, order the SAI40X524S and verify your ISO 15552 mounting interface, 40mm bore, 524mm stroke, G1/4 port (PT/G/NPT), and accessory type. Because this is a 524mm stroke, add external guides to prevent rod bending and side-load wear. If sizing up or down, neighboring bores are 32mm (402N push @0.5MPa) and 50mm (982N push @0.5MPa). The standard cylinder cannot hold a load on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X524S
- ✓ 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 SI40X524S FAQ
Yes, the AirTAC SI40X524S is discontinued. The direct replacement is the SAI40X524S. It shares the same ISO 15552 mounting interface, 40mm bore, 524mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40mm bore features a G1/4 port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa push is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X524S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X524S replacement — usually within 7-8 hours.