This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X350SFA, 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 SI63X350SFA
The AirTAC Airtac SI63 Standard Cylinder SI63X350SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X350SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X350SFA
- 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 SI63X350SFA
The AirTAC SI63X350SFA is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 350mm stroke, and FA flange mount. Delivering 1559N push force at 0.5MPa, it is directly replaced by the SAI63X350SFA. This direct upgrade shares the exact ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The -S magnet supports legacy CS1-B/DS1-B sensors. For higher temperatures, Viton H seals extend operation to 150C. Note that standard cylinders drift without live air; for load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X350SFA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X350SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X350SFA |
| Bore size | Ø63 mm |
| Stroke | 350 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 SAI63X350SFA 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 SAI63X350SFA 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 SI63X350SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×350 | 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 SI63X350SFA Is Used
Mid-Tonnage Pressing
Applies 1559N of push force at 0.5MPa for seating bearings, stamping light sheet metal, or clinching components in automated cells.
Pallet Diversion
Uses the 350mm stroke and FA flange to push heavy pallets off a main conveyor line onto a secondary packaging branch.
Vertical Lift Gates
Lifts access gates or material shutters up to 79kg safely, taking advantage of the full stroke and double-acting control.
Replacing the Airtac SI63 Standard Cylinder SI63X350SFA with the SAI63X350SFA
To replace the SI63X350SFA, order the SAI63X350SFA. Verify your FA flange mounting bolts, G3/8 port threads, and the M16x1.5 rod end. The SAI drops into existing fixtures per ISO 15552 dimensions. If you need less force, a 50mm bore provides 982N push at 0.5MPa; if you need more, an 80mm bore yields 2513N. Because the 350mm stroke exceeds 300mm, use an external guide to prevent rod bending and side-load damage. A plain cylinder does not hold load without air; add a pilot check valve or use the SAIL lock variant for safety. The -S magnet works with CS1-B/DS1-B switches, while the SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X350SFA
- ✓ 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 SI63X350SFA FAQ
Yes, the SI63X350SFA is discontinued. The direct replacement is the SAI63X350SFA. It shares the same ISO 15552 mounting interface, 63mm bore, 350mm stroke, G3/8 port, and FA flange, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a maximum theoretical force of 318kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X350SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X350SFA replacement — usually within 7-8 hours.