This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX550, 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 SI63AX550
The AirTAC SI63 Standard Cylinder SI63AX550 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 550mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX550, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke550 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX550
- 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 SI63AX550
The AirTAC SI63AX550 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 550mm stroke, and SUS420J2 stainless steel piston rod. Delivering 1559 N of push force at 0.5 MPa via a G3/8 port, it is replaced by the direct replacement SAI63AX550, which shares the exact ISO 15552 mounting interface, bore, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet and cannot take a sensor.
Airtac SI63 Standard Cylinder SI63AX550 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX550 |
| Bore size | Ø63 mm |
| Stroke | 550 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 SAI63AX550 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 SAI63AX550 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 SI63AX550
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×550 | 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 SI63AX550 Is Used
Diverting Heavy Goods
Pushes loaded pallets or totes at 90 degrees using the 1559 N push force, with the 550mm stroke clearing wide product profiles.
Stainless Rod Actuation
The SUS420J2 rod option suits light washdown or corrosive-adjacent manufacturing cells where standard carbon steel rods might degrade.
Replacing the Airtac SI63 Standard Cylinder SI63AX550 with the SAI63AX550
To replace the SI63AX550, order the SAI63AX550, confirming the ISO 15552 mounting interface, 63mm bore, 550mm stroke, G3/8 port, and SUS420J2 rod. Size both ways: a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. Note that a plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variant. With a 550mm stroke, use external guides to prevent rod bending and side loads. This non-magnet SKU cannot accept CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX550
- ✓ 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 SI63AX550 FAQ
Yes, the SI63AX550 is discontinued. The direct replacement is the SAI63AX550. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 550mm stroke, G3/8 port, and mounting fixtures.
It uses a G3/8 air port. The 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 maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX550 replacement — usually within 7-8 hours.