This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX500, 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 SI40AX500
The AirTAC Airtac SI40 Standard Cylinder SI40AX500 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 SAI40AX500, 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 → SAI40AX500
- 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 SI40AX500
The AirTAC SI40AX500 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 500mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX500, retaining identical interface, force, and mounting dimensions.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This SKU has no magnet (-S omitted), so it cannot take a sensor, though legacy SI switches were CS1-B/DS1-B. It uses a SUS420J2 stainless rod (A option).
Airtac SI40 Standard Cylinder SI40AX500 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX500 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX500 |
| 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 SAI40AX500 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 SAI40AX500 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 SI40AX500
| 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 SI40AX500 Is Used
Long-Stroke Diversion
Executes 500mm pusher strokes on packaging lines to divert products into secondary lanes.
Pallet Handling
Deploys 500mm strokes to push cartons onto accumulation pallets within distribution centers.
Replacing the Airtac SI40 Standard Cylinder SI40AX500 with the SAI40AX500
To replace the SI40AX500, order the SAI40AX500. Confirm the ISO 15552 mounting interface, 40mm bore, 500mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. Because this SKU lacks the -S magnet, it cannot accept position sensors; order an -S variant if sensing is needed. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 500mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. If sizing down, a 32mm bore gives 402N push @0.5MPa; sizing up to 50mm yields 982N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX500
- ✓ 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 SI40AX500 FAQ
Yes, the AirTAC SI40AX500 is discontinued. The direct replacement is the SAI40AX500. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 500mm stroke, output force, G1/4 port, and mounting accessories.
The bore is 40mm with a G1/4 air port. The thrust is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX500
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX500 replacement — usually within 7-8 hours.