This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX440S, 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 SI63BX440S
The AirTAC Airtac SI63 Standard Cylinder SI63BX440S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 440mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX440S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke440 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX440S
- 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 SI63BX440S
The AirTAC SI63BX440S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 440 mm stroke, and SUS304 stainless steel rod. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX440S, retaining the same interface, force, and mounting fixtures.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, and a Viton H seal option raises the temperature limit to 150 C.
Airtac SI63 Standard Cylinder SI63BX440S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX440S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX440S |
| Bore size | Ø63 mm |
| Stroke | 440 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 SAI63BX440S 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 SAI63BX440S 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 SI63BX440S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×440 | 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 SI63BX440S Is Used
Stainless Rod Diverting
Uses the SUS304 rod to resist washdown moisture while diverting packages on a 440 mm stroke carriage.
Pallet Stop Gate
Cycles a heavy pallet stop gate over 440 mm, relying on the 1559 N thrust to halt moving loads.
Replacing the Airtac SI63 Standard Cylinder SI63BX440S with the SAI63BX440S
To replace the SI63BX440S, order the SAI63BX440S and confirm the ISO 15552 mounting interface, 63 mm bore, 440 mm stroke, G3/8 port, and the SUS304 stainless rod (-B). The -S magnet requires current AirTAC switches for the SAI (legacy used CS1-B/DS1-B). For sizing, the 63 mm bore gives 1559 N push at 0.5 MPa; dropping to a 50 mm bore yields 982 N, while an 80 mm bore provides 2513 N. Because this is a 440 mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX440S
- ✓ 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 SI63BX440S FAQ
Yes, the SI63BX440S is discontinued. The direct replacement is the SAI63BX440S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 440 mm stroke, G3/8 port, and output force, so it drops directly into existing fixtures.
The G3/8 port bore delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa. At 0.7 MPa the push force is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX440S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX440S replacement — usually within 7-8 hours.