This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX650S, 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 SI63BX650S
The AirTAC SI63 Standard Cylinder SI63BX650S 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 SAI63BX650S, 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 → SAI63BX650S
- 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 SI63BX650S
The AirTAC SI63BX650S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 650mm stroke. Featuring a SUS304 stainless steel rod and a built-in magnet for CS1-B/DS1-B sensors, it delivers 1559N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX650S, which matches the interface, bore, stroke, force, and mounting exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For held loads, use an external pilot check valve or the SAIL/BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX650S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX650S |
| 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 SAI63BX650S 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 SAI63BX650S 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 SI63BX650S
| 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 SI63BX650S Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts using the 650mm stroke and 1559N force at 0.5 MPa.
Pallet Handling Gate
Actuates heavy safety gates or lifting stops in logistics hubs, benefiting from the SUS304 rod in humid settings.
Replacing the Airtac SI63 Standard Cylinder SI63BX650S with the SAI63BX650S
To replace the SI63BX650S, order the SAI63BX650S. Confirm the ISO 15552 mounting interface, the 63mm bore, the 650mm stroke, the G3/8 port, and the -S magnet for current AirTAC switches. The -B rod specifies SUS304 stainless steel for corrosion resistance. When sizing, the 63mm bore yields 1559N push at 0.5 MPa; dropping to a 50mm bore gives 982N, while an 80mm bore provides 2513N. Because the 650mm stroke is long, use external guides to prevent rod-bending and side-load damage. For load holding on air loss, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX650S
- ✓ 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 SI63BX650S FAQ
Yes, the SI63BX650S is discontinued. The direct replacement is the SAI63BX650S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 650mm stroke, G3/8 port, and mounting interface.
It uses a G3/8 air port. The force ratings are: 1559N push and 1402N pull at 0.5 MPa; 2182N push at 0.7 MPa; 2805N push at 0.9 MPa; and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX650S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX650S replacement — usually within 7-8 hours.