This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX350S, 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 SI63AX350S
The AirTAC Airtac SI63 Standard Cylinder SI63AX350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX350S
- 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 SI63AX350S
The AirTAC SI63AX350S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 350mm stroke. Delivering 1559 N push force at 0.5 MPa, it features a SUS420J2 stainless piston rod, a G3/8 port, and a built-in magnet for CS1-B/DS1-B sensors. AirTAC replaced this unit with the SAI63AX350S.
The SAI63AX350S is a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI63 Standard Cylinder SI63AX350S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX350S |
| Bore size | Ø63 mm |
| Stroke | 350 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 SAI63AX350S 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 SAI63AX350S 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 SI63AX350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×350 | 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 SI63AX350S Is Used
Stainless Rod Actuation
Leverages the SUS420J2 rod for corrosion resistance in washdown or mildly chemical machine environments requiring 1559 N push force.
Long Stroke Diverting
350mm travel suits package routing or lane changing on conveyors, provided external guides manage the side-load risks.
Replacing the Airtac SI63 Standard Cylinder SI63AX350S with the SAI63AX350S
To replace the SI63AX350S, order the SAI63AX350S and confirm the ISO 15552 mounting interface, 350mm stroke, G3/8 port, and mounting accessory. The -S magnet and -A SUS420J2 rod are retained, though the SAI uses current AirTAC switches instead of the legacy CS1-B/DS1-B. Sizing both ways: a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. For this 350mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss (the cushion only decelerates), so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX350S
- ✓ 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 SI63AX350S FAQ
Yes, the SI63AX350S is discontinued. The direct replacement is the SAI63AX350S. It shares the same ISO 15552 mounting interface, 63mm bore, 350mm stroke, force, G3/8 port, and mounting accessories, fitting existing fixtures perfectly.
It features a G3/8 air port. The force ratings are: 1559 N push and 1402 N pull at 0.5 MPa; 2182 N push at 0.7 MPa; 2805 N push at 0.9 MPa; and a theoretical max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX350S replacement — usually within 7-8 hours.