This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX900, 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 SI63BX900
The AirTAC Airtac SI63 Standard Cylinder SI63BX900 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 900mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX900, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke900 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX900
- 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 SI63BX900
The AirTAC SI63BX900 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 900mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX900, matching the interface, force, and stroke exactly.
This SKU features a SUS304 stainless piston rod for corrosion resistance but lacks a magnet, so it cannot take a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure.
Airtac SI63 Standard Cylinder SI63BX900 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX900 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX900 |
| Bore size | Ø63 mm |
| Stroke | 900 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 SAI63BX900 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 SAI63BX900 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 SI63BX900
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×900 | 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 SI63BX900 Is Used
Material Lowering
Lowers 79 kg assemblies over a 900mm descent, requiring external guides to prevent rod bending and a pilot check valve to hold the load.
Corrosive Environment Actuation
Drives machinery stages in washdown areas using the stainless SUS304 rod, delivering 2182 N at 0.7 MPa without position sensing.
Replacing the Airtac SI63 Standard Cylinder SI63BX900 with the SAI63BX900
To replace the SI63BX900, order the SAI63BX900. Confirm the ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread. Since this SKU has no magnet (-S), it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if position sensing is needed. For this 900mm stroke, use external guides to prevent rod bending and side-load wear. If sizing alternatives, a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX900
- ✓ 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 SI63BX900 FAQ
Yes, the SI63BX900 is discontinued. The direct replacement is the SAI63BX900. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 900mm stroke, G3/8 port, and mounting interface.
The bore is 63mm 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 max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX900
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX900 replacement — usually within 7-8 hours.