This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX240, 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 SI40AX240
The AirTAC Airtac SI40 Standard Cylinder SI40AX240 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 240mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX240, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX240
- 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 SI40AX240
The AirTAC SI40AX240 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 240mm stroke. Delivering 628N push and 528N pull at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX240. This direct upgrade matches the exact interface, force, and M12x1.25 rod thread.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. This SKU uses an SUS420J2 stainless rod (option A) but lacks a magnet, so it cannot take CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX240 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX240 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX240 |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAI40AX240 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 SAI40AX240 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 SI40AX240
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SI40AX240 Is Used
Medium Force Clamping
Secures workpieces in CNC machining fixtures using the 628N push force, while the SUS420J2 stainless rod resists coolant corrosion.
Package Diversion
Actuates sorting gates along packaging lines, with the 240mm stroke providing sufficient travel to redirect products cleanly.
Vertical Lift Stops
Raises lightweight pallet stops up to 32kg, relying on external flow controls for smooth descent since it lacks a lock.
Replacing the Airtac SI40 Standard Cylinder SI40AX240 with the SAI40AX240
To replace this SI40AX240, order the SAI40AX240 ensuring the ISO 15552 mounting interface, 40mm bore, 240mm stroke, G1/4 port, and SUS420J2 rod match. This non-magnet SKU cannot accept position switches. For higher force, the 50mm bore offers 982N push at 0.5MPa. At 240mm stroke, use guide rails to prevent rod bending and side loads. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX240
- ✓ 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 SI40AX240 FAQ
Yes, the SI40AX240 is discontinued. The direct replacement is the SAI40AX240, which shares the identical ISO 15552 mounting interface, 40mm bore, 240mm stroke, force, and G1/4 port.
It features a G1/4 air port and delivers 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX240
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX240 replacement — usually within 7-8 hours.