This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X850S, 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 SI63X850S
The AirTAC Airtac SI63 Standard Cylinder SI63X850S 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 SAI63X850S, 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 → SAI63X850S
- 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 SI63X850S
The AirTAC SI63X850S is a discontinued double-acting ISO 15552 profile cylinder. It delivers 1559 N push force at 0.5 MPa through a 63 mm bore, 850 mm stroke, and G3/8 port. AirTAC replaced this with the SAI63X850S, a direct upgrade retaining the exact mounting interface, output, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The SAI family adds SAIL, SAIF, and BSAI variants the SI lacked. This -S model uses CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X850S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X850S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X850S |
| 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 SAI63X850S 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 SAI63X850S 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 SI63X850S
| 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 SI63X850S Is Used
Long-Stroke Diversion
Pushes heavy pallets across 850 mm transfer lines where the 1559 N force at 0.5 MPa easily overcomes guide friction.
Press Ejection
Cycles large formed parts out of machinery beds, utilizing the 30 mm adjustable cushions to brake the rod at stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63X850S with the SAI63X850S
To replace the SI63X850S, order the SAI63X850S. It drops into existing fixtures per the ISO 15552 mounting interface, matching the 63 mm bore, 850 mm stroke, G3/8 port, and M16x1.5 rod thread. If you need less force, a 50 mm bore gives 982 N push at 0.5 MPa; for more, an 80 mm bore yields 2513 N. Because the 850 mm stroke invites rod bending, use an external guide to prevent side loads. The -S magnet works with CS1-B/DS1-B switches. For load holding on air loss, note that cushions only decelerate; use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X850S
- ✓ 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 SI63X850S FAQ
Yes, the SI63X850S is discontinued. The direct replacement is the SAI63X850S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 850 mm stroke, G3/8 port, and mounting hardware.
The G3/8 port feeds a 63 mm bore yielding 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, and the theoretical maximum is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X850S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X850S replacement — usually within 7-8 hours.