This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX20S, 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 SI63AX20S
The AirTAC Airtac SI63 Standard Cylinder SI63AX20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 20mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke20 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX20S
- 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 SI63AX20S
The AirTAC SI63AX20S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 20mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63AX20S, a direct replacement matching the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless piston rod for corrosion resistance, while the -S magnet supports CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX20S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX20S |
| Bore size | Ø63 mm |
| Stroke | 20 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 SAI63AX20S 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 SAI63AX20S 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 SI63AX20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×20 | 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 SI63AX20S Is Used
Short-Stroke Clamping
Ideal for high-force 1559N clamping tasks in machining fixtures where a compact 20mm stroke securely holds metal parts for milling or drilling operations.
Transfer Diverters
Provides robust actuation for conveyor lane diverters, using the 63mm bore's 1402N pull force to swiftly reposition packages onto secondary routing belts.
Press Ejection
Suitable for ejecting formed parts from small pneumatic presses, leveraging the 2805N push force at 0.9MPa to reliably clear stamped components.
Replacing the Airtac SI63 Standard Cylinder SI63AX20S with the SAI63AX20S
To replace the SI63AX20S, order the SAI63AX20S direct equivalent, confirming the ISO 15552 interface, 63mm bore, 20mm stroke, G3/8 port, SUS420J2 rod and -S magnet. It fits existing fixtures perfectly. For sizing down, a 50mm bore yields 982N push at 0.5MPa; sizing up to 80mm provides 2513N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The 20mm stroke is short, so side-load risks are minimal, but always verify guide alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX20S
- ✓ 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 SI63AX20S FAQ
Yes, the AirTAC SI63AX20S is discontinued. The direct replacement is the SAI63AX20S. It shares the identical ISO 15552 mounting interface, 63mm bore, 20mm stroke, output force, G3/8 port and mounting accessories, fitting existing fixtures seamlessly.
This 63mm bore cylinder features a G3/8 air port and M16x1.5 rod thread. Force ratings are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX20S replacement — usually within 7-8 hours.