This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX45, 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 SI63BX45
The AirTAC Airtac SI63 Standard Cylinder SI63BX45 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 SAI63BX45, 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 → SAI63BX45
- 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 SI63BX45
The AirTAC SI63BX45 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 45 mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX45, which shares the exact same interface, force, and mounting. This specific SKU features a SUS304 stainless steel rod (the -B option) for corrosion resistance, but because it lacks a magnet it cannot accept a position switch.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. If your fixture requires heat, Viton H seals raise the operating range to 150 C. Note that a standard cylinder drifts on air loss; the cushion only decelerates the stroke.
Airtac SI63 Standard Cylinder SI63BX45 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX45 |
| 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 SAI63BX45 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 SAI63BX45 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 SI63BX45
| 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 SI63BX45 Is Used
Stainless Rod Clamping
Ideal for packaging lines where washdown occurs, leveraging the SUS304 rod to resist corrosion while providing 1559 N of clamping thrust.
Short-Stroke Diversion
The 45 mm stroke quickly actuates diverter gates on material handling conveyors, offering a safe 935 N working load for repetitive tasks.
Replacing the Airtac SI63 Standard Cylinder SI63BX45 with the SAI63BX45
To replace the discontinued SI63BX45, order the SAI63BX45. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the 63 mm bore, 45 mm stroke, M16x1.5 rod thread, and G3/8 port. Confirm your mounting accessory (LB, FA, TC, etc.) and thread standard (PT, G, NPT). Because this SKU lacks the -S magnet, it cannot support legacy CS1-B or DS1-B sensors; if sensing is needed, select an SAI model with an S suffix. For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Remember that a plain cylinder does not hold load without live air; for load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX45
- ✓ 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 SI63BX45 FAQ
Yes, the SI63BX45 is discontinued. The direct replacement is the SAI63BX45. It shares the identical ISO 15552 mounting interface, 63 mm bore, 45 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
This 63 mm bore cylinder uses 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 of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63BX45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX45 replacement — usually within 7-8 hours.