This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX500S, 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 SI40AX500S
The AirTAC Airtac SI40 Standard Cylinder SI40AX500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX500S
- 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 SI40AX500S
The AirTAC SI40AX500S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 500mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40AX500S, matching the interface, force and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This SI40AX500S has an SUS420J2 stainless rod and a magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX500S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX500S |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAI40AX500S 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 SAI40AX500S 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 SI40AX500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SI40AX500S Is Used
Long-Stroke Diversion
Pushes packages across a 500mm transfer gap with a 628N push force at 0.5 MPa, guided externally to prevent rod bending.
Stainless Rod Ejection
Ejects machined aluminum parts in a humid cell using the SUS420J2 rod option to resist corrosion over the long 500mm travel.
Replacing the Airtac SI40 Standard Cylinder SI40AX500S with the SAI40AX500S
To replace the SI40AX500S, order the SAI40AX500S. Confirm the ISO 15552 mounting interface, 500mm stroke, G1/4 port and the -S magnet for current AirTAC switches. At 0.5MPa the 40mm bore yields 628N push; sizing down to 32mm gives 402N, while sizing up to 50mm gives 982N. The SUS420J2 rod offers corrosion resistance. For the 500mm stroke, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX500S
- ✓ 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 SI40AX500S FAQ
Yes, the SI40AX500S is discontinued. The direct replacement is the SAI40AX500S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 500mm stroke, G1/4 port and mounting fixtures.
The G1/4 port supplies double-acting thrust of 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX500S replacement — usually within 7-8 hours.