This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X550, 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 SI63X550
The AirTAC Airtac SI63 Standard Cylinder SI63X550 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 SAI63X550, 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 → SAI63X550
- 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 SI63X550
The AirTAC SI63X550 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 550 mm stroke. It delivers 1559 N push at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X550, matching the interface, force and stroke exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. This SKU lacks a magnet, so it cannot take a CS1-B/DS1-B sensor.
Airtac SI63 Standard Cylinder SI63X550 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X550 |
| 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 SAI63X550 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 SAI63X550 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 SI63X550
| 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 SI63X550 Is Used
Long-Stroke Diversion
Pushes heavy pallets across transfer lines using the 1559 N force over the 550 mm travel distance.
Warehouse Ejection
Ejects packaged goods from sorting stations, benefiting from the 30-800 mm/s speed range.
Replacing the Airtac SI63 Standard Cylinder SI63X550 with the SAI63X550
To replace the SI63X550, order the SAI63X550. Verify the ISO 15552 mounting interface, 63 mm bore, 550 mm stroke, G3/8 port and M16x1.5 rod thread. Because this is a non-magnet SKU, it cannot accept position sensors. At 550 mm, prevent rod bending by using external guides to manage side loads. For sizing, the 80 mm bore offers 2513 N, while the 50 mm bore gives 982 N at 0.5 MPa. Note that air cushions only decelerate; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X550
- ✓ 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 SI63X550 FAQ
Yes, the SI63X550 is discontinued. The direct replacement is the SAI63X550, which shares the same ISO 15552 mounting interface, 63 mm bore, 550 mm stroke, output force and G3/8 port.
The 63 mm bore uses a G3/8 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.
Request a Quote for the SAI63X550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X550 replacement — usually within 7-8 hours.