This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50FTC, 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 SI63X50FTC
The AirTAC Airtac SI63 Standard Cylinder SI63X50FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X50FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X50FTC
- 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 SI63X50FTC
The AirTAC SI63X50FTC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 50mm stroke, delivering 1559 N push force at 0.5 MPa through its G3/8 port. Because this legacy series is end-of-life, you should order the direct replacement: SAI63X50FTC. It shares the same FTC trunnion mounting, bore, stroke, and output force, fitting your existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note that this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. If you need load holding on air loss, explore the SAIL or BSAI lock variants instead of relying on the air cushion.
Airtac SI63 Standard Cylinder SI63X50FTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50FTC |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63X50FTC 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 SAI63X50FTC 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 SI63X50FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63X50FTC Is Used
Clamp Actuation
Ideal for mid-force clamping of workpieces in CNC machining centers, utilizing the 1559 N push force and short 50mm stroke for rapid cycling.
Package Diverting
Drives short-stroke diverters or routing gates on packaging lines, where the FTC trunnion mount handles the side-load pivot action effectively.
Pallet Stopping
Acts as a heavy-duty stopper block for pallets on roller conveyors, absorbing impact using the adjustable 30mm air cushions at both ends.
Replacing the Airtac SI63 Standard Cylinder SI63X50FTC with the SAI63X50FTC
To replace the discontinued SI63X50FTC, order the SAI63X50FTC. Verify your ISO 15552 interface dimensions, 63mm bore, 50mm stroke, G3/8 port, and FTC trunnion mount. This non-magnet SKU cannot support position sensing; order an SAI63X50FTCS if you need CS1-B/DS1-B switches. For sizing, the 63mm bore gives 1559 N push at 0.5 MPa; dropping to a 50mm bore yields 982 N, while an 80mm bore provides 2513 N. A plain cylinder drifts without air and the cushion only decelerates, so use an external rod lock or pilot check valve for load holding. The SAIL lock or BSAI clamp-lock variants offer integrated braking.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50FTC
- ✓ 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 SI63X50FTC FAQ
Yes, the SI63X50FTC is discontinued. The direct replacement is the AirTAC SAI63X50FTC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 50mm stroke, G3/8 port, and FTC mounting interface.
The 63mm bore features a G3/8 air port and delivers 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa. It uses a 20mm rod with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X50FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50FTC replacement — usually within 7-8 hours.