This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX350, 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 SI63BX350
The AirTAC Airtac SI63 Standard Cylinder SI63BX350 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 SAI63BX350, 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 → SAI63BX350
- 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 SI63BX350
The AirTAC SI63BX350 is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 350 mm stroke. It delivered 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX350, which matches the original bore, stroke, force, port, and ISO 15552 mounting interface exactly for seamless fixture integration. This specific SKU includes a SUS304 stainless steel piston rod for corrosion resistance.
The SAI upgrade introduces an improved piston seal utilizing two Y-shaped one-way elements for extended life and lower start-up pressure. As this SKU lacks the -S magnet, it cannot accept position switches. For load-holding, note that standard cylinders drift on air loss; the cushion only decelerates. Use an external pilot check valve or explore SAI family lock variants.
Airtac SI63 Standard Cylinder SI63BX350 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX350 |
| 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 SAI63BX350 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 SAI63BX350 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 SI63BX350
| 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 SI63BX350 Is Used
Stainless Rod Actuation
Ideal for packaging lines requiring washdown resistance, utilizing the SUS304 rod to push 1559 N loads over a 350 mm travel distance.
Mid-Range Transfer
Deploys a 79 kg vertical lift capacity to index heavy pallets between conveyor sections without requiring external pneumatics.
Guided Material Handling
Handles 350 mm stroke actuation for automated storage systems, requiring external guides to prevent rod bending during lateral moves.
Replacing the Airtac SI63 Standard Cylinder SI63BX350 with the SAI63BX350
To replace the discontinued SI63BX350, order the SAI63BX350, confirming the ISO 15552 mounting interface, 63 mm bore, 350 mm stroke, and G3/8 port. Specify the B code for the SUS304 stainless steel rod if corrosion resistance is required. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with a magnet. For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. At 350 mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. A plain cylinder does not hold load without air; for secure holding, consider the SAIL or BSAI lock variants or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX350
- ✓ 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 SI63BX350 FAQ
Yes, the AirTAC SI63BX350 is discontinued. The direct replacement is the SAI63BX350. It is dimensionally interchangeable per ISO 15552, maintaining the same 63 mm bore, 350 mm stroke, 1559 N force, G3/8 port, and mounting interface.
The bore is 63 mm with 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX350
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX350 replacement — usually within 7-8 hours.