This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX400, 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 SI40AX400
The AirTAC Airtac SI40 Standard Cylinder SI40AX400 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX400, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX400
- 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 SI40AX400
The AirTAC SI40AX400 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 400mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX400. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and output force.
The SAI40AX400 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix denotes a SUS420J2 stainless steel rod for corrosion resistance. Without a -S magnet, this SKU cannot take a sensor.
Airtac SI40 Standard Cylinder SI40AX400 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX400 |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAI40AX400 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 SAI40AX400 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 SI40AX400
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SI40AX400 Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line utilizing the 628N push force and 400mm reach.
Component Ejection
Ejects machined parts from a fixture with the SUS420J2 stainless rod resisting coolant splash.
Pallet Stopper
Acts as a 400mm stroke pneumatic stop for pallets entering a wrapping station, safely decelerating loads.
Replacing the Airtac SI40 Standard Cylinder SI40AX400 with the SAI40AX400
To replace the SI40AX400, order the SAI40AX400. Confirm the ISO 15552 mounting interface, 40mm bore, 400mm stroke, G1/4 port, and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For sizing, the 32mm bore neighbor yields 402N push at 0.5MPa, while the 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 400mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX400
- ✓ 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 SI40AX400 FAQ
Yes, the SI40AX400 is discontinued. The direct replacement is the SAI40AX400, which maintains the same ISO 15552 mounting interface, 40mm bore, 400mm stroke, output force, and G1/4 port.
The G1/4 port feeds a 16mm rod. It provides 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 SAI40AX400
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX400 replacement — usually within 7-8 hours.