This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX45S, 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 SI63BX45S
The AirTAC Airtac SI63 Standard Cylinder SI63BX45S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 45mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX45S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke45 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX45S
- 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 SI63BX45S
The AirTAC SI63BX45S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 45 mm stroke. It delivers 1559 N push force at 0.5 MPa, features a SUS304 stainless piston rod for corrosion resistance, and uses a G3/8 port. The direct replacement is the SAI63BX45S, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock or valve variants the SI lacked.
Airtac SI63 Standard Cylinder SI63BX45S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX45S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX45S |
| Bore size | Ø63 mm |
| Stroke | 45 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 SAI63BX45S 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 SAI63BX45S 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 SI63BX45S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×45 | 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 SI63BX45S Is Used
Stainless Rod Clamping
Ideal for repetitive short-stroke clamping in machining cells where the SUS304 rod resists coolant corrosion.
Packaging Line Diversion
Provides reliable 1559 N push force at 0.5 MPa for diverting heavier cartons on automated packaging conveyors.
Replacing the Airtac SI63 Standard Cylinder SI63BX45S with the SAI63BX45S
To replace the SI63BX45S, order the SAI63BX45S and confirm the ISO 15552 mounting interface, 63 mm bore, 45 mm stroke, G3/8 port (PT/G/NPT thread), and the SUS304 stainless rod option. The -S magnet allows for position sensing; the SI used CS1-B/DS1-B switches, whereas the SAI takes current AirTAC sensors. If sizing up or down, neighboring bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, specify an external pilot check valve, rod lock, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX45S
- ✓ 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 SI63BX45S FAQ
Yes, the SI63BX45S is discontinued. The direct replacement is the SAI63BX45S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 45 mm stroke, 1559 N force, G3/8 port, and mounting fixtures.
The 63 mm bore uses a G3/8 port. At 0.5 MPa it provides 1559 N push and 1402 N pull force. At 0.7 MPa push 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 SAI63BX45S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX45S replacement — usually within 7-8 hours.