This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX50S, 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 SI63AX50S
The AirTAC Airtac SI63 Standard Cylinder SI63AX50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX50S
- 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 SI63AX50S
The AirTAC SI63AX50S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 50 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63AX50S, which shares the exact same mounting interface, force, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The -A suffix specifies a SUS420J2 stainless steel rod, while the -S denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX50S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX50S |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63AX50S 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 SAI63AX50S 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 SI63AX50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63AX50S Is Used
Clamp Actuation
Securing heavy steel workpieces on machining fixtures using the 1559 N push force and SUS420J2 stainless rod.
Package Diversion
Driving short-stroke routing gates on assembly lines where the 50 mm travel and 30-800 mm/s speed are optimal.
Pallet Stops
Actuating heavy-duty stopper cylinders at conveyor endpoints to halt pallets up to 79 kg safely.
Replacing the Airtac SI63 Standard Cylinder SI63AX50S with the SAI63AX50S
To replace the SI63AX50S, order the SAI63AX50S. Confirm the ISO 15552 mounting interface, 63 mm bore, 50 mm stroke, G3/8 port, and your specific mounting accessory. The -S magnet enables CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors. The -A rod is SUS420J2 stainless steel. If you need higher force, the 80 mm bore yields 2513 N push at 0.5 MPa; if lower force is acceptable, the 50 mm bore yields 982 N. A plain cylinder drifts on air loss, so for load holding consider the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX50S
- ✓ 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 SI63AX50S FAQ
Yes, the SI63AX50S is discontinued. The direct replacement is the SAI63AX50S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 50 mm stroke, 1559 N force, G3/8 port, and mounting interface.
The 63 mm bore features a G3/8 port and delivers 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa it pushes 2182 N, and 2805 N at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX50S replacement — usually within 7-8 hours.