This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX165S, 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 SI40AX165S
The AirTAC SI40 Standard Cylinder SI40AX165S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 165mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX165S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke165 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX165S
- 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 SI40AX165S
The AirTAC SI40AX165S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 165mm stroke, and a SUS420J2 stainless steel rod. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX165S. This direct upgrade shares identical ISO 15552 mounting dimensions, stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The -S magnet supports CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants.
Airtac SI40 Standard Cylinder SI40AX165S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX165S |
| Bore size | Ø40 mm |
| Stroke | 165 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 SAI40AX165S 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 SAI40AX165S 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 SI40AX165S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×165 | 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 SI40AX165S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for corrosion resistance in packaging machines requiring moderate 628N push force over a 165mm non-standard travel.
Mid-Stroke Diversion
Handles product redirecting on conveyors where a specific 165mm reach is needed, utilizing the 30-800mm/s speed range for rapid cycling.
Replacing the Airtac SI40 Standard Cylinder SI40AX165S with the SAI40AX165S
To replace the SI40AX165S, order the SAI40AX165S, confirming the ISO 15552 interface, 40mm bore, 165mm stroke, G1/4 port, and mounting accessory. The 165mm length is non-standard; verify fixture clearance. For sizing, the neighbouring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore provides 982N. Note that plain cylinders drift on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock for load holding. The -A rod is SUS420J2 stainless steel, and the -S magnet works with CS1-B/DS1-B switches. For this 165mm stroke, ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX165S
- ✓ 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 SI40AX165S FAQ
Yes, the SI40AX165S is discontinued. The direct replacement is the SAI40AX165S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 165mm stroke, force, G1/4 port, and mounting interface.
The 40mm bore uses a G1/4 port. It delivers 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. Operating pressure is 0.15-1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX165S replacement — usually within 7-8 hours.