This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX400S, 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 SI63AX400S
The AirTAC Airtac SI63 Standard Cylinder SI63AX400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 400mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke400 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX400S
- 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 SI63AX400S
The AirTAC SI63AX400S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 400mm stroke, and a SUS420J2 stainless steel rod. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this EOL unit with the SAI63AX400S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI63 Standard Cylinder SI63AX400S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX400S |
| Bore size | Ø63 mm |
| Stroke | 400 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 SAI63AX400S 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 SAI63AX400S 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 SI63AX400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×400 | 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 SI63AX400S Is Used
Material Diversion
Actuates routing gates on packaging lines, utilizing the 1559 N push force to reliably shift heavy product flows at 0.5 MPa.
Pallet Handling
Drives 400mm stroke lifting arms for pallet positioning, where the SUS420J2 stainless rod resists humidity and environmental corrosion.
Replacing the Airtac SI63 Standard Cylinder SI63AX400S with the SAI63AX400S
To replace the SI63AX400S, order the SAI63AX400S. Confirm the ISO 15552 mounting interface, the 63mm bore, 400mm stroke, G3/8 port (PT/G/NPT thread options), and your specific mounting accessory. The -S magnet and -A SUS420J2 stainless rod carry over directly. When sizing, a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. Because the stroke is 400mm, use an external guide to prevent rod-bending and side-load wear. A plain cylinder drifts without live air; for load holding, specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX400S
- ✓ 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 SI63AX400S FAQ
Yes, the SI63AX400S is discontinued. The direct replacement is the SAI63AX400S. It shares the identical ISO 15552 mounting interface, 63mm bore, 400mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The bore is 63mm with a G3/8 air port. Force output is 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX400S replacement — usually within 7-8 hours.