This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX850, 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 SI63BX850
The AirTAC Airtac SI63 Standard Cylinder SI63BX850 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 SAI63BX850, 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 → SAI63BX850
- 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 SI63BX850
The AirTAC SI63BX850 is a discontinued double-acting ISO 15552 profile cylinder with an 850 mm stroke. It delivers 1559 N push at 0.5 MPa through a G3/8 port. The SUS304 stainless rod suits corrosive settings. The direct replacement is the SAI63BX850, retaining the exact bore, stroke, force, port and mounting interface.
The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. This SKU lacks a magnet, so it cannot take a switch. For load holding, the SAIL lock variant or an external pilot check valve is required.
Airtac SI63 Standard Cylinder SI63BX850 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX850 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX850 |
| 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 SAI63BX850 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 SAI63BX850 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 SI63BX850
| 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 SI63BX850 Is Used
Long-Stroke Diversion
Pushes heavy pallets across transfer lines using the 850 mm stroke, relying on external guides to prevent rod bending.
Corrosive Material Handling
Actuates lifting gates in humid or wash-down zones, leveraging the SUS304 stainless rod for rust prevention.
Replacing the Airtac SI63 Standard Cylinder SI63BX850 with the SAI63BX850
To replace the SI63BX850, order the SAI63BX850. Verify the ISO 15552 mounting interface, G3/8 port, and M16x1.5 thread. This non-magnet SKU cannot accept a sensor; if position feedback is needed, select an SAI model with the S suffix. At 850 mm, prevent rod bending by using external guides to absorb side loads. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa; dropping to a 50 mm bore gives 982 N, while an 80 mm bore provides 2513 N. If load holding is required, use an external rod lock or the SAIL/BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX850
- ✓ 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 SI63BX850 FAQ
Yes, the SI63BX850 is discontinued. The direct replacement is the SAI63BX850. It is dimensionally interchangeable per ISO 15552, keeping the same 63 mm bore, 850 mm stroke, force, G3/8 port and mounting.
It uses a G3/8 port. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX850
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX850 replacement — usually within 7-8 hours.