This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX650, 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 SI63AX650
The AirTAC Airtac SI63 Standard Cylinder SI63AX650 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 SAI63AX650, 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 → SAI63AX650
- 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 SI63AX650
The AirTAC SI63AX650 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 650 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63AX650, matching the interface, force, and stroke exactly.
This SKU features a SUS420J2 stainless steel rod (option A) but lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure.
Airtac SI63 Standard Cylinder SI63AX650 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX650 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX650 |
| 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 SAI63AX650 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 SAI63AX650 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 SI63AX650
| 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 SI63AX650 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 650 mm travel, relying on external guides to prevent rod bending during lateral actuation.
Stainless Rod Actuation
Drives tooling stages in humid environments using the SUS420J2 rod option, while the SAI direct maintains the exact ISO 15552 footprint.
Replacing the Airtac SI63 Standard Cylinder SI63AX650 with the SAI63AX650
To replace the SI63AX650, order the SAI63AX650. Confirm the ISO 15552 mounting interface, the 63 mm bore, 650 mm stroke, and G3/8 port. Because this is a non-magnet SKU, it cannot support legacy CS1-B/DS1-B switches; add the -S suffix on the SAI if sensing is needed. At 0.5 MPa it yields 1559 N push and 1402 N pull; if undersized, the 80 mm bore offers 2513 N. For the 650 mm stroke, use external guides to prevent rod bending and side-load damage. The cushion only decelerates; for load holding on air loss, specify a SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX650
- ✓ 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 SI63AX650 FAQ
Yes, the SI63AX650 is discontinued. The direct replacement is the SAI63AX650. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 650 mm stroke, 1559 N force, and G3/8 port for existing fixtures.
This double-acting cylinder has a 63 mm bore, 650 mm stroke, M16x1.5 rod thread, and G3/8 port. Force ratings are 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX650
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX650 replacement — usually within 7-8 hours.