This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X45, 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 SI63X45
The AirTAC Airtac SI63 Standard Cylinder SI63X45 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 SAI63X45, 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 → SAI63X45
- 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 SI63X45
The AirTAC SI63X45 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 45mm stroke. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63X45. This direct successor shares the exact ISO 15552 mounting interface, bore, and output force, fitting existing fixtures perfectly.
The SAI upgrade features a redesigned piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This SI63X45 SKU lacks a magnet, so it cannot accept position sensors.
Airtac SI63 Standard Cylinder SI63X45 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X45 |
| 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 SAI63X45 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 SAI63X45 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 SI63X45
| 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 SI63X45 Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in machining fixtures using its 1559N push force at 0.5 MPa for rigid holding.
Package Diversion
Drives short-stroke routing gates on assembly lines, providing fast 30-800 mm/s actuation.
Pallet Stopping
Acts as a robust end-stop for loaded pallets, absorbing kinetic energy via its 30mm adjustable air cushion.
Replacing the Airtac SI63 Standard Cylinder SI63X45 with the SAI63X45
To replace the SI63X45, order the SAI63X45. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G3/8 port thread (PT/G/NPT), and M16x1.5 rod end. Because this specific SKU has no -S magnet, it cannot support CS1-B/DS1-B switches; if sensing is needed, select an SAI63X45S. The 63mm bore yields 1559N push at 0.5MPa; dropping to 50mm gives 982N, while 80mm provides 2513N. Note that plain cylinders drift on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X45
- ✓ 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 SI63X45 FAQ
Yes, the AirTAC SI63X45 is discontinued. The direct replacement is the SAI63X45. It shares the same ISO 15552 mounting interface, 63mm bore, 45mm stroke, G3/8 port, and output force, dropping directly into existing machinery.
The 63mm bore uses a G3/8 air port. Force output is 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.
Request a Quote for the SAI63X45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X45 replacement — usually within 7-8 hours.