This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX150, 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 SI40AX150
The AirTAC Airtac SI40 Standard Cylinder SI40AX150 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX150, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX150
- 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 SI40AX150
The AirTAC SI40AX150 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 150mm stroke. It delivers 628N push and 528N pull at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX150, a direct upgrade retaining the exact interface, force, and mounting.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet, so it cannot accept a sensor. For load holding, note the cushion only decelerates; use an external rod lock or pilot check valve.
Airtac SI40 Standard Cylinder SI40AX150 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX150 |
| Bore size | Ø40 mm |
| Stroke | 150 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 SAI40AX150 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 SAI40AX150 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 SI40AX150
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SI40AX150 Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line using 628N thrust at 0.5MPa, utilizing the 150mm stroke for rapid sorting cycles.
Clamp Actuation
Secures aluminum extrusions during machining operations, providing 528N pull force while the SUS420J2 stainless rod resists coolant corrosion.
Replacing the Airtac SI40 Standard Cylinder SI40AX150 with the SAI40AX150
To replace the SI40AX150, order the SAI40AX150. Confirm the ISO 15552 mounting interface, 40mm bore, 150mm stroke, G1/4 port (PT/G/NPT), and M12x1.25 rod thread. Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B switches; order a magnet-equipped SAI if sensing is needed. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. For dropped-load safety, the cushion only decelerates; add a pilot check valve or explore the SAIL or BSAI lock variants. With a 150mm stroke, standard guide clearance is adequate, but maintain alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX150
- ✓ 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 SI40AX150 FAQ
Yes, the SI40AX150 is discontinued. The direct replacement is the SAI40AX150. It shares the identical ISO 15552 mounting interface, 40mm bore, 150mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly while adding an upgraded piston seal.
The G1/4 port bore 40mm cylinder 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. It operates at 30-800mm/s with a 27mm adjustable air cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX150
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX150 replacement — usually within 7-8 hours.