This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X440SN, 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 SI63X440SN
The AirTAC Airtac SI63 Standard Cylinder SI63X440SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 440mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X440SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke440 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X440SN
- 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 SI63X440SN
The AirTAC SI63X440SN is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 440mm stroke, G3/8 port and M16x1.5 rod thread. It delivers 1559N push and 1402N pull at 0.5MPa. AirTAC replaced it with the SAI63X440SN, a direct sharing the same interface, force, port and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The NBR seal handles -20 to +70C; Viton H extends this to 150C. The -S magnet works with CS1-B/DS1-B sensors, while SAIL lock and BSAI clamp variants cover load holding.
Airtac SI63 Standard Cylinder SI63X440SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X440SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X440SN |
| Bore size | Ø63 mm |
| Stroke | 440 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 SAI63X440SN 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 SAI63X440SN 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 SI63X440SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×440 | 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 SI63X440SN Is Used
Material Diversion
Actuates routing gates on package lines, using the 440mm stroke to clear wide product lanes reliably.
Vertical Lift Stops
Raises and lowers pallet stops in low-force vertical handling, safely moving loads near the 79kg limit.
Component Ejection
Pushes machined parts out of CNC fixtures, relying on the 1559N thrust to clear metal chips.
Replacing the Airtac SI63 Standard Cylinder SI63X440SN with the SAI63X440SN
To replace the SI63X440SN, order the SAI63X440SN direct. Verify the ISO 15552 mounting interface, G3/8 port, M16x1.5 thread and 440mm stroke. The -S magnet enables CS1-B/DS1-B sensors, and the -N NBR seal suits standard temperatures. For sizing, a 50mm bore gives 982N push at 0.5MPa, while an 80mm bore yields 2513N. A plain cylinder drifts without live air; use a pilot check valve or SAIL lock to hold loads. At 440mm, use external guides to prevent rod bending from side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X440SN
- ✓ 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 SI63X440SN FAQ
Yes, the SI63X440SN is discontinued. The direct replacement is the SAI63X440SN. It shares the identical ISO 15552 mounting interface, 63mm bore, 440mm stroke, G3/8 port and output force, fitting existing fixtures perfectly.
This 63mm bore cylinder has a G3/8 port and generates 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X440SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X440SN replacement — usually within 7-8 hours.