This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX185, 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 SI63BX185
The AirTAC Airtac SI63 Standard Cylinder SI63BX185 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 185mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX185, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX185
- 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 SI63BX185
The AirTAC SI63BX185 is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 185 mm stroke, and a SUS304 stainless steel piston rod. Delivering 1559 N push force at 0.5 MPa, it is replaced by the direct replacement SAI63BX185, which shares the exact G3/8 port, M16x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Without a magnet, this SKU cannot take a sensor. For load holding, use an external rod lock or pilot check valve, as cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX185 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX185 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX185 |
| Bore size | Ø63 mm |
| Stroke | 185 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 SAI63BX185 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 SAI63BX185 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 SI63BX185
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×185 | 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 SI63BX185 Is Used
Stainless Rod Actuation
Ideal for packaging or washdown stations needing the SUS304 corrosion-resistant rod, delivering 1559 N push force at 0.5 MPa for medium-duty clamping.
Material Diversion
Provides robust 185 mm stroke to push products between conveyor lanes, utilizing the 30-800 mm/s speed range for rapid, repeatable cycling.
Pallet Positioning
Handles structural alignment of pallets in packaging cells, leveraging the ISO 15552 profile barrel for rigid mounting and stable load transfer.
Replacing the Airtac SI63 Standard Cylinder SI63BX185 with the SAI63BX185
To replace the discontinued SI63BX185, order the SAI63BX185. Verify the ISO 15552 mounting interface, 185 mm stroke, G3/8 port, and SUS304 (-B) rod. Because this SKU lacks a magnet, it cannot accept CS1-B/DS1-B sensors. If you need to hold a load without live air, the plain cylinder will drift; use an external pilot check valve or explore the SAIL or BSAI lock variants. For force sizing, the 63 mm bore yields 1559 N push at 0.5 MPa. If undersized, the 80 mm bore provides 2513 N push; if oversized, the 50 mm bore offers 982 N push.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX185
- ✓ 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 SI63BX185 FAQ
Yes, the SI63BX185 is discontinued. The direct replacement is the SAI63BX185. It shares the identical ISO 15552 mounting interface, 63 mm bore, 185 mm stroke, G3/8 port, and SUS304 stainless rod, fitting existing fixtures perfectly.
This 63 mm bore double-acting cylinder features a G3/8 air port. Theoretical forces are 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 maximum force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX185
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX185 replacement — usually within 7-8 hours.