This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X320SFTC, 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 SI63X320SFTC
The AirTAC Airtac SI63 Standard Cylinder SI63X320SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 320mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X320SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke320 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X320SFTC
- 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 SI63X320SFTC
The AirTAC SI63X320SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 320mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X320SFTC, matching the exact bore, stroke, force, port, and FTC trunnion mounting interface for seamless fixture integration.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent from the legacy SI line, while retaining the CS1-B/DS1-B compatible magnet setup.
Airtac SI63 Standard Cylinder SI63X320SFTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X320SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X320SFTC |
| Bore size | Ø63 mm |
| Stroke | 320 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 SAI63X320SFTC 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 SAI63X320SFTC 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 SI63X320SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×320 | 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 SI63X320SFTC Is Used
Pallet Diversion
Actuates diverter arms on packaging lines, using the 320mm stroke to shift pallets smoothly between parallel conveyor belts.
Clamp Actuation
Provides reliable clamping force for machining fixtures, driving tooling blocks against aluminum castings during automated milling.
Vertical Lift Gate
Raises and lowers mezzanine safety gates, lifting loads near the 79 kg vertical limit while relying on external guides to prevent rod bending.
Replacing the Airtac SI63 Standard Cylinder SI63X320SFTC with the SAI63X320SFTC
To replace the SI63X320SFTC, order the SAI63X320SFTC. Verify the ISO 15552 interface, 63mm bore, 320mm stroke, G3/8 port, and FTC trunnion mount. The -S magnet supports CS1-B/DS1-B sensors. For sizing, a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. At 320mm, prevent rod bending by using an external guide to absorb side loads. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X320SFTC
- ✓ 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 SI63X320SFTC FAQ
Yes, the SI63X320SFTC is discontinued. The direct replacement is the SAI63X320SFTC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 320mm stroke, G3/8 port, and FTC trunnion mounting interface.
The 63mm 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 maximum of 318 kgf at 1.0 MPa. The piston rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X320SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X320SFTC replacement — usually within 7-8 hours.