This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX800S, 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 SI40AX800S
The AirTAC Airtac SI40 Standard Cylinder SI40AX800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX800S
- 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 SI40AX800S
The AirTAC SI40AX800S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 800mm stroke, and a SUS420J2 stainless steel rod. Delivering 628 N push at 0.5 MPa, it is replaced by the SAI40AX800S. This direct upgrade shares the same G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet works with legacy CS1-B/DS1-B sensors, while a plain cylinder cannot hold load without air—use a pilot check valve or SAIL lock variant for holding.
Airtac SI40 Standard Cylinder SI40AX800S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX800S |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40AX800S 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 SAI40AX800S 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 SI40AX800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40AX800S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with its 800mm reach, using the SUS420J2 rod to resist moisture in washdown areas.
Vertical Lowering
Lowers 32 kg payloads smoothly at 0.5 MPa, relying on external guides to manage the 800mm stroke side-load risks.
Pallet Handling
Actuates gating and stopper mechanisms on pallet conveyors, delivering 628 N of push force via the G1/4 air port.
Replacing the Airtac SI40 Standard Cylinder SI40AX800S with the SAI40AX800S
To replace the SI40AX800S, order the SAI40AX800S. Verify the ISO 15552 mounting interface, 40mm bore, 800mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), and the -A rod is SUS420J2 stainless. If sizing alternatives, a 32mm bore yields 402 N [email protected], while a 50mm bore yields 982 N. Note that an 800mm stroke requires external guides to prevent rod-bending side loads. For load holding on air loss, select the SAIL or BSAI lock variant, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX800S
- ✓ 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 SI40AX800S FAQ
Yes, the SI40AX800S is discontinued. The direct replacement is the SAI40AX800S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 800mm stroke, 628 N force, G1/4 port, and mounting interface.
The G1/4 port feeds a 40mm bore yielding 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and 1130 N push at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa, operating at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX800S replacement — usually within 7-8 hours.