This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X350SN, 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 SI63X350SN
The AirTAC Airtac SI63 Standard Cylinder SI63X350SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X350SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X350SN
- 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 SI63X350SN
The AirTAC SI63X350SN is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 350 mm stroke, and a G3/8 air port. Delivering 1559 N of push force at 0.5 MPa, it is replaced by the SAI63X350SN. This direct successor maintains the exact bore, stroke, output force, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade introduces an improved piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This SI63X350SN unit includes a piston magnet for CS1-B/DS1-B switches and an NBR seal (-N) rated for -20 to +70 C.
Airtac SI63 Standard Cylinder SI63X350SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X350SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X350SN |
| Bore size | Ø63 mm |
| Stroke | 350 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 SAI63X350SN 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 SAI63X350SN 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 SI63X350SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×350 | 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 SI63X350SN Is Used
Package Diversion
Actuates routing gates on packaging lines where the 1559 N push force at 0.5 MPa easily deflects heavy cartons.
Material Lowering
Controls the descent of platforms in assembly cells, relying on the 30 mm adjustable air cushions to decelerate smoothly.
Clamp Actuation
Drives large pneumatic clamps holding workpieces, taking advantage of the 1402 N pull force for secure hold-down operations.
Replacing the Airtac SI63 Standard Cylinder SI63X350SN with the SAI63X350SN
To replace the discontinued SI63X350SN, order the SAI63X350SN direct, confirming the ISO 15552 mounting interface, 63 mm bore, 350 mm stroke, G3/8 port, and your specific mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while the -N NBR seal handles standard temperatures. For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, whereas an 80 mm bore provides 2513 N. Remember that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Because 350 mm exceeds 300 mm, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X350SN
- ✓ 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 SI63X350SN FAQ
Yes, the SI63X350SN is discontinued. The direct replacement is the SAI63X350SN. It features the same 63 mm bore, 350 mm stroke, G3/8 port, and ISO 15552 mounting interface, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 63 mm bore features a G3/8 air port and a 20 mm rod. It generates 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 maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X350SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X350SN replacement — usually within 7-8 hours.