This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X550STC, 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 SI63X550STC
The AirTAC SI63 Standard Cylinder SI63X550STC 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 SAI63X550STC, 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 → SAI63X550STC
- 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 SI63X550STC
The AirTAC SI63X550STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 550mm stroke, TC trunnion mount, and a piston magnet. Delivering 1559 N push at 0.5 MPa via a G3/8 port, it is replaced by the SAI63X550STC. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force, and port, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X550STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X550STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X550STC |
| 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 SAI63X550STC 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 SAI63X550STC 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 SI63X550STC
| 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 SI63X550STC Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 550mm stroke, relying on the adjustable end cushions to brake the 1559 N thrust smoothly.
Pallet Push-Off
Acts as a lateral ejector for palletized goods, where the TC trunnion mount accommodates the slight articulation needed over long travel.
Replacing the Airtac SI63 Standard Cylinder SI63X550STC with the SAI63X550STC
To replace the SI63X550STC, order the SAI63X550STC. Verify the ISO 15552 TC trunnion interface, 63mm bore, 550mm stroke, G3/8 port (PT/G/NPT thread options), and the -S magnet. Sizing both ways: a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. At 550mm, prevent rod bending by adding external guides to manage side loads. A plain cylinder drifts on air loss; cushions only decelerate. For load holding, use an external pilot check valve, or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X550STC
- ✓ 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 SI63X550STC FAQ
Yes, the SI63X550STC is discontinued. The direct replacement is the SAI63X550STC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 550mm stroke, TC mount, G3/8 port, and output force.
This double-acting cylinder uses a G3/8 port. It delivers 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 SAI63X550STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X550STC replacement — usually within 7-8 hours.