This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX65, 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 SI63BX65
The AirTAC Airtac SI63 Standard Cylinder SI63BX65 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 65mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX65, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke65 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX65
- 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 SI63BX65
The AirTAC SI63BX65 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 65mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. This version features a SUS304 stainless steel rod for corrosion resistance, but because it lacks a magnet (-S), it cannot accept position sensors.
You must replace it with the direct replacement SAI63BX65. It shares the exact ISO 15552 mounting interface, stroke, and force. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note that a plain cylinder drifts without air; use a pilot check valve or SAIL lock variant to hold loads.
Airtac SI63 Standard Cylinder SI63BX65 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX65 |
| Bore size | Ø63 mm |
| Stroke | 65 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 SAI63BX65 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 SAI63BX65 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 SI63BX65
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×65 | 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 SI63BX65 Is Used
Stainless Rod Washdown
Ideal for food or chemical processing where the SUS304 rod resists moisture while providing 1559 N push force for actuating process valves.
Package Diverting
The 65mm stroke quickly pushes packages at 30-800 mm/s, fitting neatly into ISO 15552 fixture mounts for sorting lines.
Pallet Stops
Uses 1402 N pull force at 0.5 MPa to deploy heavy-duty stopping gates on roller conveyors, safely halting pallets up to 79 kg.
Replacing the Airtac SI63 Standard Cylinder SI63BX65 with the SAI63BX65
To replace the SI63BX65, order the SAI63BX65. Verify the ISO 15552 mounting interface, the 65mm stroke, and the G3/8 port. Because this specific SKU lacks the -S magnet suffix, it cannot support CS1-B or DS1-B sensors; order an -S variant if position detection is needed. The SUS304 (-B) stainless rod is retained for corrosion resistance. If sizing up or down, neighbouring bores are 50mm (982 N push @0.5 MPa) and 80mm (2513 N push @0.5 MPa). For load holding, remember the air cushion only decelerates at stroke end and does not lock the piston; integrate an external rod lock, a pilot check valve, or switch to the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX65
- ✓ 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 SI63BX65 FAQ
Yes, the SI63BX65 is discontinued. The direct replacement is the SAI63BX65. It shares the same ISO 15552 mounting interface, 63mm bore, 65mm stroke, G3/8 port, and force ratings, fitting existing fixtures perfectly.
The 63mm bore provides 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 theoretical force of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s. The port size is G3/8.
Request a Quote for the SAI63BX65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX65 replacement — usually within 7-8 hours.