This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X350, 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 SI63X350
The AirTAC Airtac SI63 Standard Cylinder SI63X350 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 SAI63X350, 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 → SAI63X350
- 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 SI63X350
The AirTAC SI63X350 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 350mm stroke, delivering 1559N push force at 0.5MPa. It is directly replaced by the SAI63X350 direct upgrade, sharing the exact interface, port and force. This non-magnet SKU cannot accept a sensor.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants lacking in the SI line.
Airtac SI63 Standard Cylinder SI63X350 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X350 |
| 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 SAI63X350 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 SAI63X350 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 SI63X350
| 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 SI63X350 Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line using 1559N thrust at 0.5MPa over a 350mm reach.
Press Ejection
Clears formed parts from a stamping die area, requiring the 30mm adjustable air cushion to decelerate the rod.
Pallet Stops
Acts as a pneumatic stop for incoming pallets, handling the impact with the 20mm carbon steel rod.
Replacing the Airtac SI63 Standard Cylinder SI63X350 with the SAI63X350
To replace the SI63X350, order the SAI63X350 keeping the identical 63mm bore, 350mm stroke, G3/8 port, M16x1.5 thread and ISO 15552 mounting. If sizing up or down, neighboring bores 50mm and 80mm offer 982N and 2513N push at 0.5MPa respectively. Because this is a non-S SKU, it cannot take a CS1-B/DS1-B sensor. For load holding, note the cushion only decelerates; use a pilot check valve or the SAIL/BSAI lock variant. At 350mm, use external guides to prevent rod bending from side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X350
- ✓ 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 SI63X350 FAQ
Yes, the SI63X350 is discontinued. The direct replacement is the AirTAC SAI63X350. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 350mm stroke, G3/8 port and mounting interface.
The G3/8 port bore delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a max force of 318kgf at 1.0MPa. It operates at 30-800mm/s.
Request a Quote for the SAI63X350
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X350 replacement — usually within 7-8 hours.