This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX400, 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 SI63AX400
The AirTAC Airtac SI63 Standard Cylinder SI63AX400 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 SAI63AX400, 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 → SAI63AX400
- 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 SI63AX400
The AirTAC SI63AX400 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 400 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63AX400, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force and port. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This specific SKU uses a SUS420J2 stainless steel rod (A suffix) and lacks a magnet, so it cannot accept position sensors.
The SAI family also introduces lock and valve variants the SI lacked, including the SAIL air-released lock, SAIF built-in valve, and BSAI clamp-lock. Note that a plain cylinder drifts on air loss; use SAIL or BSAI for load holding.
Airtac SI63 Standard Cylinder SI63AX400 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX400 |
| 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 SAI63AX400 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 SAI63AX400 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 SI63AX400
| 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 SI63AX400 Is Used
Diverting Heavy Goods
Pushes heavy cartons or totes on a packaging line using its 1559 N thrust at 0.5 MPa, with the 400 mm stroke clearing wide conveyor lanes.
Pallet Handling
Actuates stops or lifts within pallet transfer systems, where the SUS420J2 stainless rod offers corrosion resistance in humid environments.
Replacing the Airtac SI63 Standard Cylinder SI63AX400 with the SAI63AX400
To replace the SI63AX400, order the SAI63AX400. Verify your ISO 15552 mounting accessory (LB, FA, CA, TC) and the G3/8 port thread (PT, G or NPT). Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order an -S SAI if sensing is needed. The SUS420J2 stainless rod is retained. For sizing alternatives: a 50 mm bore gives 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. If you need to hold a load vertically without live air, a standard cylinder drifts—select the SAIL or BSAI lock variant, or add an external pilot check valve. Finally, at 400 mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX400
- ✓ 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 SI63AX400 FAQ
Yes, the SI63AX400 is discontinued. The direct replacement is the AirTAC SAI63AX400. It shares the identical ISO 15552 mounting interface, 63 mm bore, 400 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly while upgrading the piston seal.
This 63 mm bore double-acting cylinder features a G3/8 air port. It generates 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and 2805 N push at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX400
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX400 replacement — usually within 7-8 hours.