This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX165S, 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 SI63 Standard Cylinder SI63AX165S
The AirTAC Airtac SI63 Standard Cylinder SI63AX165S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 165mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX165S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke165 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX165S
- 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 SI63 Standard Cylinder SI63AX165S
The AirTAC SI63AX165S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 165mm stroke, and a SUS420J2 stainless piston rod. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is directly replaced by the SAI63AX165S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, and output force, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet supports legacy CS1-B/DS1-B sensors, while a Viton H seal option can extend operation to 150 C.
Airtac SI63 Standard Cylinder SI63AX165S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX165S |
| Bore size | Ø63 mm |
| Stroke | 165 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63AX165S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63AX165S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63AX165S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | 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 SI63 Standard Cylinder SI63AX165S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for corrosion resistance in washdown clamping tasks requiring 1559 N of push force at 0.5 MPa.
Mid-Stroke Diversion
Uses the 165mm stroke to push heavy packages between conveyor lanes, benefiting from the 30-800 mm/s speed range.
Replacing the Airtac SI63 Standard Cylinder SI63AX165S with the SAI63AX165S
To replace the SI63AX165S, order the SAI63AX165S and confirm the ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread. The -A suffix denotes the SUS420J2 stainless rod, and -S denotes the magnet for CS1-B/DS1-B switches. If you need more force, the neighbouring 80mm bore yields 2513 N push at 0.5 MPa; if less is required, the 50mm bore yields 982 N. Remember that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX165S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63AX165S FAQ
Yes, the SI63AX165S is discontinued. The direct replacement is the SAI63AX165S. It shares the same ISO 15552 mounting interface, 63mm bore, 165mm stroke, output force, G3/8 port, and SUS420J2 stainless rod, fitting directly into existing fixtures.
This double-acting cylinder features a G3/8 air port. It delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa. At 0.7 MPa the push force is 2182 N, and the theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX165S replacement — usually within 7-8 hours.