This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX680S, 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 SI63BX680S
The AirTAC Airtac SI63 Standard Cylinder SI63BX680S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 680mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX680S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke680 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX680S
- 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 SI63BX680S
The AirTAC SI63BX680S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 680mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63BX680S, matching the bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures. This -B variant features a SUS304 stainless piston rod for corrosion resistance.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63BX680S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX680S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX680S |
| Bore size | Ø63 mm |
| Stroke | 680 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 SAI63BX680S 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 SAI63BX680S 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 SI63BX680S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×680 | 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 SI63BX680S Is Used
Long-Stroke Diversion
Drives large sorter flaps or lane diverts over a 680mm travel where the SUS304 rod resists humid washdown environments.
Corrosive Transfer
Actuates sliding gates or heavy workpiece shuttles in chemical zones, leveraging the stainless rod for moisture defense.
Replacing the Airtac SI63 Standard Cylinder SI63BX680S with the SAI63BX680S
To replace the SI63BX680S, order the SAI63BX680S and confirm the ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread. Retain the -B SUS304 rod and -S magnet, noting the SAI uses current AirTAC switches instead of legacy CS1-B/DS1-B sensors. For sizing, the neighboring 80mm bore yields 2513 N push at 0.5 MPa, whereas dropping to 50mm provides 982 N. At 680mm, this stroke requires external guides to prevent rod bending and side-load damage. A plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX680S
- ✓ 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 SI63BX680S FAQ
Yes, the SI63BX680S is discontinued. The direct replacement is the SAI63BX680S. It is dimensionally interchangeable per ISO 15552, retaining the exact 63mm bore, 680mm stroke, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
This double-acting cylinder features a G3/8 air port. It generates 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 force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX680S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX680S replacement — usually within 7-8 hours.