This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX850S, 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 SI63AX850S
The AirTAC Airtac SI63 Standard Cylinder SI63AX850S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX850S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX850S
- 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 SI63AX850S
The AirTAC SI63AX850S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 850mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa through a G3/8 port. The direct replacement is the SAI63AX850S, which shares the same ISO 15552 mounting interface, stroke, force, and porting. The SAI features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life.
This specific unit has the SUS420J2 stainless steel piston rod (-A) and a built-in magnet (-S) for legacy CS1-B/DS1-B sensors. Note that a standard cylinder drifts without live air; the cushion only decelerates near stroke end. For load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX850S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX850S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX850S |
| Bore size | Ø63 mm |
| Stroke | 850 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 SAI63AX850S 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 SAI63AX850S 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 SI63AX850S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×850 | 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 SI63AX850S Is Used
Long-Stroke Diversion
Pushes heavy pallets laterally across transfer lines using the 850mm stroke and 1559N push force at 0.5MPa.
Stainless Rod Actuation
Drives tooling in humid washdown cells using the SUS420J2 rod option, with the magnet tracking position.
Replacing the Airtac SI63 Standard Cylinder SI63AX850S with the SAI63AX850S
To replace the SI63AX850S, order the SAI63AX850S. It drops directly into existing ISO 15552 fixtures with identical 63mm bore, 850mm stroke, M16x1.5 rod thread, G3/8 port, and 30mm cushions. Confirm your mounting accessory (LB, FA, TC, etc.) and that the -S magnet is specified for current AirTAC switches. If you need more force, the 80mm bore offers 2513N push at 0.5MPa; if less is acceptable, the 50mm bore provides 982N. Because the 850mm stroke is long, prevent rod bending by using external guides to manage side loads. For applications requiring load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX850S
- ✓ 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 SI63AX850S FAQ
Yes, the SI63AX850S is discontinued. The direct replacement is the SAI63AX850S. It shares the same ISO 15552 mounting interface, 63mm bore, 850mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. Theoretical forces are 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a maximum of 318kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX850S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX850S replacement — usually within 7-8 hours.