This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX65S, 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 SI63BX65S
The AirTAC SI63 Standard Cylinder SI63BX65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 65mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke65 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX65S
- 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 SI63BX65S
The AirTAC SI63BX65S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 65mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, features a SUS304 stainless steel rod, and uses a G3/8 port. The direct replacement is the SAI63BX65S, which shares the exact ISO 15552 mounting interface, force, and dimensions.
The SAI upgrade introduces 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, while the SAI family adds SAIL, SAIF, and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX65S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX65S |
| Bore size | Ø63 mm |
| Stroke | 65 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 SAI63BX65S 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 SAI63BX65S 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 SI63BX65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×65 | 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 SI63BX65S Is Used
Stainless Rod Clamping
Ideal for mid-force clamping tasks where the SUS304 rod resists moisture or washdown chemicals in food and beverage lines.
Package Diverting
Provides reliable 65mm actuation to push packages off a belt, utilizing 1559N of thrust at 0.5MPa for positive transfers.
Gating Mechanisms
Drives heavy-duty sorting gates and stops, where the robust 63mm bore handles high impact without deflecting.
Replacing the Airtac SI63 Standard Cylinder SI63BX65S with the SAI63BX65S
To replace the SI63BX65S, order the SAI63BX65S keeping the 63mm bore, 65mm stroke, G3/8 port, and SUS304 rod. Verify your ISO 15552 mounting accessory (LB, FA, TC) and thread type (PT/G/NPT). If you need to size up or down, neighbouring bores are 50mm (982N push @0.5MPa) and 80mm (2513N push @0.5MPa). Because this is a standard cylinder, it will not hold a load without air; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. If your stroke was 300mm or longer, you would need to guide against rod bending, but at 65mm side-load risk is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX65S
- ✓ 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 SI63BX65S FAQ
Yes, the SI63BX65S is discontinued. The direct replacement is the SAI63BX65S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 65mm stroke, G3/8 port, and mounting interface. The SAI features an upgraded piston seal but retains the same output force.
The 63mm bore uses a G3/8 port. Force ratings are: 1559N push and 1402N pull at 0.5MPa; 2182N push at 0.7MPa; 2805N push at 0.9MPa; and a theoretical max of 318kgf at 1.0MPa. Operating pressure is 0.15-1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX65S replacement — usually within 7-8 hours.