This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX15S, 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 SI40AX15S
The AirTAC Airtac SI40 Standard Cylinder SI40AX15S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX15S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX15S
- 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 SI40AX15S
The AirTAC SI40AX15S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 15mm stroke, and an SUS420J2 stainless steel rod. It delivers 628 N push and 528 N pull at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40AX15S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, G1/4 port, and M12x1.25 rod thread.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet supports legacy CS1-B/DS1-B sensors, while a plain cylinder cannot hold loads without live air—consider the SAIL or BSAI lock variants for that.
Airtac SI40 Standard Cylinder SI40AX15S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX15S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX15S |
| Bore size | Ø40 mm |
| Stroke | 15 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 SAI40AX15S 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 SAI40AX15S 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 SI40AX15S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 SI40AX15S Is Used
Short-Stroke Clamping
Ideal for compact 15mm clamping tasks where the 628 N push force securely holds workpieces without requiring full stroke extension.
Stainless Rod Ejector
The SUS420J2 rod option provides corrosion resistance for ejection mechanisms in mildly wet or chemically exposed manufacturing environments.
Sensor-Ready Diverting
Using the built-in magnet with CS1-B/DS1-B switches, this cylinder accurately actuates diverter gates in packaging lines.
Replacing the Airtac SI40 Standard Cylinder SI40AX15S with the SAI40AX15S
To replace the SI40AX15S, order the SAI40AX15S and confirm the ISO 15552 mounting interface, G1/4 port (PT/G/NPT), and your specific mounting accessory. The 15mm stroke is nonstandard (below the typical 25mm minimum), so verify the exact extended length. The -A code specifies the SUS420J2 stainless rod for corrosion resistance, and -S means the magnet is present for CS1-B/DS1-B switches. For sizing both ways: a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For secure load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX15S
- ✓ 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 SI40AX15S FAQ
Yes, the SI40AX15S is discontinued. The direct replacement is the SAI40AX15S. It shares the same ISO 15552 mounting interface, 40mm bore, 15mm stroke, force, G1/4 port, and SUS420J2 rod, fitting existing fixtures perfectly.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. It 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX15S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX15S replacement — usually within 7-8 hours.