This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X350FTC, 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 SI63X350FTC
The AirTAC Airtac SI63 Standard Cylinder SI63X350FTC 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 SAI63X350FTC, 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 → SAI63X350FTC
- 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 SI63X350FTC
The AirTAC SI63X350FTC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 350mm stroke, and FTC trunnion mount. Delivering 1559 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI63X350FTC. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, and force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI63 Standard Cylinder SI63X350FTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X350FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X350FTC |
| 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 SAI63X350FTC 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 SAI63X350FTC 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 SI63X350FTC
| 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 SI63X350FTC Is Used
Pallet Diversion
Routes heavy pallets on a packaging line using the FTC trunnion mount to handle the 350mm reach and 1559 N thrust.
Press Ejection
Pushes machined parts from a fixture, relying on the adjustable 30mm air cushions to decelerate the rod at cycle end.
Replacing the Airtac SI63 Standard Cylinder SI63X350FTC with the SAI63X350FTC
To replace the SI63X350FTC, order the SAI63X350FTC. Verify the ISO 15552 FTC trunnion mount, 63mm bore, 350mm stroke, G3/8 port (PT/G/NPT thread options), and M16x1.5 rod thread. Because this SKU has no -S magnet, it cannot accept CS1-B/DS1-B sensors; choose an SAI with S if sensing is needed. Sizing both ways: a 50mm bore gives 982 N push @0.5 MPa, while an 80mm bore gives 2513 N. At 350mm stroke, use external guides to prevent rod bending and side-load wear. For load holding on air loss, add an external rod lock or pilot check valve, or use the SAIL/BSAI lock variants, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X350FTC
- ✓ 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 SI63X350FTC FAQ
Yes, the AirTAC SI63X350FTC is discontinued. The direct replacement is the SAI63X350FTC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 350mm stroke, G3/8 port, and FTC trunnion mounting interface.
The 63mm bore uses a G3/8 port. It generates 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and 2805 N push at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X350FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X350FTC replacement — usually within 7-8 hours.