This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX850S, 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 SI63BX850S
The AirTAC Airtac SI63 Standard Cylinder SI63BX850S 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 SAI63BX850S, 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 → SAI63BX850S
- 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 SI63BX850S
The AirTAC SI63BX850S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 850mm stroke, and a SUS304 stainless steel rod. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63BX850S, matching the interface, force, and stroke exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. Because this is an 850mm stroke, use external guides to prevent rod bending. Note that plain cylinders drift without air; use SAIL or BSAI lock variants for load holding.
Airtac SI63 Standard Cylinder SI63BX850S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX850S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX850S |
| 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 SAI63BX850S 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 SAI63BX850S 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 SI63BX850S
| 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 SI63BX850S Is Used
Long-Stroke Diversion
Pushes heavy pallets laterally across conveyor lanes using the full 850mm travel, relying on the stainless rod for environmental resilience.
Automated Press Transfer
Moves structural blanks between stamping stations, using adjustable end cushions to decelerate the moving mass smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63BX850S with the SAI63BX850S
To replace the SI63BX850S, order the SAI63BX850S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC), the 63mm bore, 850mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B sensors. The -B rod is SUS304 stainless steel. For sizing, a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. At 850mm, external guides are critical to manage side loads and prevent rod bending. A plain cylinder does not hold load without air; for secure holding, use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX850S
- ✓ 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 SI63BX850S FAQ
Yes, the SI63BX850S is discontinued. The direct replacement is the SAI63BX850S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 850mm stroke, G3/8 port, and mounting interface, but adds an upgraded two Y-shaped piston seal for longer life.
This double-acting cylinder has a G3/8 port, M16x1.5 rod thread, and operates at 30-800 mm/s. Force ratings are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318 kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX850S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX850S replacement — usually within 7-8 hours.