This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX500SH, 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 SI40AX500SH
The AirTAC Airtac SI40 Standard Cylinder SI40AX500SH 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 SAI40AX500SH, 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 → SAI40AX500SH
- 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 SI40AX500SH
The AirTAC SI40AX500SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 500mm stroke, G1/4 port, and 628N push force at 0.5MPa. Featuring a SUS420J2 stainless rod, Viton H high-temp seals (0-150C), and a piston magnet for CS1-B/DS1-B sensors, it is replaced by the direct replacement SAI40AX500SH.
The SAI40AX500SH shares the exact ISO 15552 mounting interface, bore, and output force. It upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure. The SAI family also adds SAIL, SAIF, and BSAI lock variants.
Airtac SI40 Standard Cylinder SI40AX500SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX500SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX500SH |
| 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 SAI40AX500SH 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 SAI40AX500SH 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 SI40AX500SH
| 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 SI40AX500SH Is Used
High-Temp Diverting
Drives diverter arms on hot-end packaging conveyors where the Viton H seal withstands 0-150C ambient heat.
Stainless Pusher
Pushes 32kg cartons vertically in humid washdown zones using the SUS420J2 corrosion-resistant rod option.
Extended Reach Gating
Actuates safety gates over a 500mm span, requiring external guides to prevent rod bending during motion.
Replacing the Airtac SI40 Standard Cylinder SI40AX500SH with the SAI40AX500SH
To replace the SI40AX500SH, order the SAI40AX500SH. Confirm the ISO 15552 mounting interface, 40mm bore, 500mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet enables current AirTAC switches, while the -A rod is SUS420J2 stainless and -H provides Viton high-temp seals. For sizing, a 32mm bore yields 402N push at 0.5MPa, whereas a 50mm bore yields 982N. At 500mm stroke, prevent rod bending by using an external guide to manage side loads. Note that a plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX500SH
- ✓ 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 SI40AX500SH FAQ
Yes, the SI40AX500SH is discontinued. The direct replacement is the SAI40AX500SH. It shares the same ISO 15552 mounting interface, 40mm bore, 500mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40mm bore uses a G1/4 port. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX500SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX500SH replacement — usually within 7-8 hours.