This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X165S, 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 SI63X165S
The AirTAC Airtac SI63 Standard Cylinder SI63X165S 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 SAI63X165S, 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 → SAI63X165S
- 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 SI63X165S
The AirTAC SI63X165S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 165mm stroke. It delivers 1559N push force at 0.5MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X165S, a direct upgrade retaining the exact interface, bore, stroke, output force, and mounting dimensions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the original SI line.
Airtac SI63 Standard Cylinder SI63X165S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X165S |
| 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 SAI63X165S 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 SAI63X165S 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 SI63X165S
| 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 SI63X165S Is Used
Clamp Actuation
Drives medium-duty machining clamps requiring 935N safe working force to secure steel billets during milling operations.
Package Diverting
Powers heavy-duty conveyor diverters and sorting gates, utilizing the G3/8 port for rapid 30-800mm/s cycling.
Replacing the Airtac SI63 Standard Cylinder SI63X165S with the SAI63X165S
To replace the SI63X165S, order the SAI63X165S. Confirm the ISO 15552 mounting interface, 63mm bore, 165mm stroke, G3/8 port (PT/G/NPT thread options), and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet is required for current AirTAC switches. If you need more force, the neighbouring 80mm bore yields 2513N at 0.5MPa; if less is needed, the 50mm bore provides 982N. A plain SAI does not hold load without live air, as the cushion only decelerates. For load holding on air loss, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X165S
- ✓ 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 SI63X165S FAQ
Yes, the SI63X165S is discontinued. The direct replacement is the AirTAC SAI63X165S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 165mm stroke, G3/8 port, output force, and mounting fixtures.
This 63mm bore cylinder features a G3/8 air port and M16x1.5 rod thread. Theoretical forces are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a maximum force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X165S replacement — usually within 7-8 hours.