This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX180S, 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 SI40AX180S
The AirTAC Airtac SI40 Standard Cylinder SI40AX180S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX180S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX180S
- 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 SI40AX180S
The AirTAC SI40AX180S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 180mm stroke, and a SUS420J2 stainless steel rod. Generating 628 N push at 0.5 MPa, its direct replacement is the SAI40AX180S, which shares the exact same interface, G1/4 port, and force. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life.
The -S magnet works with legacy CS1-B/DS1-B sensors, while a Viton H seal option raises the temperature limit to 150 C. Note that air cushions only decelerate; use a pilot check valve or SAIL lock variant to hold loads.
Airtac SI40 Standard Cylinder SI40AX180S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX180S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX180S |
| Bore size | Ø40 mm |
| Stroke | 180 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 SAI40AX180S 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 SAI40AX180S 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 SI40AX180S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SI40AX180S Is Used
Diverting Gate Actuation
Drives lightweight routing flaps on packaging lines, utilizing the 180mm stroke and stainless rod for reliable, corrosion-resistant performance.
Small Part Ejection
Pushes machined components out of a fixture with 628 N push force at 0.5 MPa, safely within the 377 N working load margin.
Carton Flap Folding
Folds cardboard flaps during automated packing, where the adjustable 27 mm air cushions ensure soft, damage-free end-of-stroke contact.
Replacing the Airtac SI40 Standard Cylinder SI40AX180S with the SAI40AX180S
To replace the SI40AX180S, order the SAI40AX180S. Confirm the ISO 15552 mounting interface, the 40mm bore, 180mm stroke, G1/4 port (PT/G/NPT), and your mounting accessory. The -S magnet allows position sensing, and the -A rod specifies SUS420J2 stainless steel. If you need more force, the 50mm bore yields 982 N push at 0.5 MPa; if less is required, the 32mm bore provides 402 N. Remember that a standard cylinder drifts without live air—the cushion only decelerates—so use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant for load holding. The SAIF variant integrates a 4M valve if you need compact control.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX180S
- ✓ 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 SI40AX180S FAQ
Yes, the AirTAC SI40AX180S is discontinued. The direct replacement is the SAI40AX180S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 180mm stroke, force, G1/4 port, and mounting interface, but features an upgraded two Y-shaped element piston seal.
The bore is 40 mm with a G1/4 air port and an M12x1.25 rod thread. Force outputs are: 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 maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX180S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX180S replacement — usually within 7-8 hours.