This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X350S, 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 SI63X350S
The AirTAC Airtac SI63 Standard Cylinder SI63X350S 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 SAI63X350S, 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 → SAI63X350S
- 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 SI63X350S
The AirTAC SI63X350S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore and 350mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, operating through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X350S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also expands options with SAIL, SAIF, and BSAI lock variants absent from the SI line. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X350S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X350S |
| 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 SAI63X350S 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 SAI63X350S 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 SI63X350S
| 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 SI63X350S Is Used
Package Diverting
Drives diverter arms on sorting lines, using the 350mm stroke to push cartons smoothly between adjacent conveyor belts.
Pallet Positioning
Indexes empty pallets into a wrapping station, providing reliable 1559N push force at 0.5MPa to square heavy loads.
Material Lowering
Lowers light fixtures or gates, where the 1402N pull force at 0.5MPa securely retracts the 20mm rod over the 350mm travel.
Replacing the Airtac SI63 Standard Cylinder SI63X350S with the SAI63X350S
To replace the SI63X350S, order the SAI63X350S. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/8 port thread (PT/G/NPT), and the -S magnet for current AirTAC switches. Sizing checks: a 50mm bore yields 982N push, whereas an 80mm bore yields 2513N at 0.5MPa. Because the stroke is 350mm, add external guides to prevent rod bending under side loads. 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 → SAI63X350S
- ✓ 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 SI63X350S FAQ
Yes, the SI63X350S is discontinued. The direct replacement is the SAI63X350S. It shares the same ISO 15552 mounting interface, 63mm bore, 350mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The G3/8 port size is fixed by the 63mm bore. At 0.5MPa, push force is 1559N and pull is 1402N. At 0.7MPa push is 2182N, and at 0.9MPa it is 2805N. The theoretical maximum force is 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X350S replacement — usually within 7-8 hours.