This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX650S, 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 SI63AX650S
The AirTAC SI63 Standard Cylinder SI63AX650S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 650mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX650S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke650 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX650S
- 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 SI63AX650S
The AirTAC SI63AX650S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 650mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa through a G3/8 port. The direct replacement is the SAI63AX650S, matching the interface, force and stroke exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless rod, and the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX650S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX650S |
| Bore size | Ø63 mm |
| Stroke | 650 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 SAI63AX650S 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 SAI63AX650S 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 SI63AX650S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×650 | 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 SI63AX650S Is Used
Long-Stroke Diversion
Pushes packages across sorting lanes using the full 650mm travel, relying on the 1559N force to overcome friction without stalling.
Multi-Station Indexing
Shifts tooling carriages between machining cells, using the adjustable 30mm air cushions to decelerate the moving mass smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63AX650S with the SAI63AX650S
To replace the SI63AX650S, order the SAI63AX650S direct. Confirm the ISO 15552 mounting interface, 63mm bore, 650mm stroke, G3/8 port, and your specific mounting accessory. The -A rod is SUS420J2 stainless and the -S magnet enables current AirTAC switches on the SAI. For sizing down, a 50mm bore gives 982N [email protected]; sizing up, an 80mm bore yields 2513N. For load holding on air loss, use an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variant. At 650mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX650S
- ✓ 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 SI63AX650S FAQ
Yes, the SI63AX650S is discontinued. The direct replacement is the SAI63AX650S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 650mm stroke, G3/8 port, and mounting interface.
This double-acting cylinder uses a G3/8 port. It delivers 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. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX650S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX650S replacement — usually within 7-8 hours.