This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX300S, 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 SI63AX300S
The AirTAC Airtac SI63 Standard Cylinder SI63AX300S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 300mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX300S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX300S
- 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 SI63AX300S
The AirTAC SI63AX300S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 300mm stroke. Delivering 1559N push and 1402N pull at 0.5MPa via a G3/8 port, it is replaced by the SAI63AX300S. This direct successor shares identical mounting, force, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Your -A code specifies a SUS420J2 stainless rod, and -S means a piston magnet for legacy CS1-B/DS1-B sensors. For higher heat, Viton H seals raise the -20 to +70C range to 150C.
Airtac SI63 Standard Cylinder SI63AX300S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX300S |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAI63AX300S 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 SAI63AX300S 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 SI63AX300S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SI63AX300S Is Used
Clamp Actuation
Provides 1559N of clamping force at 0.5MPa for securing mid-weight workpieces during CNC machining.
Vertical Pressing
Pushes with 2182N at 0.7MPa for light assembly presses, requiring external guides for the 300mm stroke.
Package Diverting
Drives diverting arms or stops on production lines, with the -S magnet enabling position confirmation.
Replacing the Airtac SI63 Standard Cylinder SI63AX300S with the SAI63AX300S
To replace this SI63AX300S, order the SAI63AX300S. Confirm the ISO 15552 mounting interface, 300mm stroke, G3/8 port, and your -A SUS420J2 rod and -S magnet. If sizing up or down, adjacent bores are 50mm (982N [email protected]) and 80mm (2513N [email protected]). At 300mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX300S
- ✓ 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 SI63AX300S FAQ
Yes, the SI63AX300S is discontinued. The direct replacement is the SAI63AX300S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 300mm stroke, G3/8 port, and mounting interface.
The G3/8 port feeds a 63mm bore yielding 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a 318kgf max at 1.0MPa. The 300mm stroke operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX300S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX300S replacement — usually within 7-8 hours.