This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX45S, 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 SI63AX45S
The AirTAC Airtac SI63 Standard Cylinder SI63AX45S 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 SAI63AX45S, 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 → SAI63AX45S
- 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 SI63AX45S
The AirTAC SI63AX45S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 45mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63AX45S, matching the exact bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -A suffix denotes a SUS420J2 stainless rod, while the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX45S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX45S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX45S |
| 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 SAI63AX45S 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 SAI63AX45S 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 SI63AX45S
| 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 SI63AX45S Is Used
Mid-Tonnage Clamping
Holds workpieces securely in machining fixtures using 1559 N of thrust at 0.5 MPa.
Package Diversion
Actuates routing gates on 63mm bore assemblies where a compact 45mm stroke is required.
Replacing the Airtac SI63 Standard Cylinder SI63AX45S with the SAI63AX45S
To replace the SI63AX45S, order the SAI63AX45S. Confirm the ISO 15552 mounting interface, 63mm bore, 45mm stroke, G3/8 port (PT/G/NPT thread), SUS420J2 rod and the -S magnet for current AirTAC switches. For sizing, a 50mm bore yields 982 N push at 0.5 MPa, whereas an 80mm bore yields 2513 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX45S
- ✓ 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 SI63AX45S FAQ
Yes, the SI63AX45S is discontinued. The direct replacement is the SAI63AX45S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 45mm stroke, output force, G3/8 port and mounting interface.
The 63mm bore uses a G3/8 port. At 0.5 MPa it provides 1559 N push and 1402 N pull. 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 SAI63AX45S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX45S replacement — usually within 7-8 hours.