This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX650, 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 SI63BX650
The AirTAC Airtac SI63 Standard Cylinder SI63BX650 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 650mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX650, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke650 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX650
- 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 SI63BX650
The AirTAC SI63BX650 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 650 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63BX650, matching the interface, stroke, force and mounting exactly.
This specific SKU features a SUS304 stainless steel rod for corrosion resistance but lacks a magnet, meaning it cannot accept position switches. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure. For load holding, note the cushion only decelerates; use an external rod lock or SAIL variant.
Airtac SI63 Standard Cylinder SI63BX650 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX650 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX650 |
| Bore size | Ø63 mm |
| Stroke | 650 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 SAI63BX650 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 SAI63BX650 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 SI63BX650
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×650 | 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 SI63BX650 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 650 mm reach, utilizing the 1559 N thrust at 0.5 MPa to overcome guide friction.
Elevated Lowering
Lowers stacked materials using the SUS304 stainless rod, resisting washdown moisture while safely managing a 79 kg vertical lift load.
Pallet Handling
Extends to position empty pallets at machining cells, relying on external guides to prevent rod bending over the 650 mm extension.
Replacing the Airtac SI63 Standard Cylinder SI63BX650 with the SAI63BX650
To replace the SI63BX650, order the SAI63BX650. Confirm the ISO 15552 mounting interface, 63 mm bore, 650 mm stroke, G3/8 port (PT/G/NPT thread) and mounting accessory. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, switch to a magnet-equipped SAI. Sizing options: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. At 650 mm stroke, prevent rod bending by using external guides to manage side loads. For load holding on air loss, select the SAIL lock or BSAI clamp-lock variant, or use a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX650
- ✓ 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 SI63BX650 FAQ
Yes, the SI63BX650 is discontinued. The direct replacement is the SAI63BX650. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 650 mm stroke, G3/8 port, force and mounting fixtures.
It 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 max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX650
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX650 replacement — usually within 7-8 hours.