This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X680S, 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 SI63X680S
The AirTAC SI63 Standard Cylinder SI63X680S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 680mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X680S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke680 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X680S
- 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 SI63X680S
The AirTAC SI63X680S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 680 mm stroke, G3/8 port and M16x1.5 rod thread. It delivers 1559 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI63X680S, a direct upgrade retaining the exact ISO 15552 mounting interface, stroke and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. Viton H seals can raise the -20 to +70 C range to 150 C.
Airtac SI63 Standard Cylinder SI63X680S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X680S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X680S |
| Bore size | Ø63 mm |
| Stroke | 680 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 SAI63X680S 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 SAI63X680S 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 SI63X680S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×680 | 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 SI63X680S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 680 mm travel, relying on the adjustable end cushions to decelerate the payload smoothly.
Multi-Station Indexing
Shifts machining pallets between sequential stations, requiring external linear guides to prevent rod bending over the extended length.
Replacing the Airtac SI63 Standard Cylinder SI63X680S with the SAI63X680S
To replace the SI63X680S, order the SAI63X680S. Confirm the ISO 15552 mounting fixture (LB, FA, TC, etc.), the G3/8 port thread, and the -S magnet requirement. When sizing, a 50 mm bore yields 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. Because this is a 680 mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. A plain SAI does not hold load on air loss; the cushion only decelerates. For secure holding, use the SAIL or BSAI lock variants, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X680S
- ✓ 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 SI63X680S FAQ
Yes, the SI63X680S is discontinued. The direct replacement is the AirTAC SAI63X680S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 680 mm stroke, output force, G3/8 port, and accessories, so it fits existing fixtures perfectly.
The 63 mm bore 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, 2805 N push at 0.9 MPa, and a maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X680S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X680S replacement — usually within 7-8 hours.