This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25SFTC, 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 SI63X25SFTC
The AirTAC Airtac SI63 Standard Cylinder SI63X25SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X25SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X25SFTC
- 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 SI63X25SFTC
The AirTAC SI63X25SFTC is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 1559 N push force at 0.5 MPa through its 63 mm bore. It features a 25 mm stroke, a G3/8 port, an M16x1.5 rod thread, and an FTC trunnion mount.
You should order the SAI63X25SFTC as the direct replacement. It shares the same ISO 15552 mounting interface, bore, stroke, output force, and port size. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI63 Standard Cylinder SI63X25SFTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25SFTC |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAI63X25SFTC 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 SAI63X25SFTC 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 SI63X25SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | 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 SI63X25SFTC Is Used
Short-Stroke Clamping
Ideal for holding parts during machining operations, utilizing the 1559 N push force within a compact 25 mm travel.
Package Diverting
Provides robust actuation for routing heavier items on material handling lines where a 63 mm bore ensures positive displacement.
Pallet Stop Gates
Acts as a high-force physical stop mechanism in conveyor endpoints, withstanding dynamic impacts during pallet accumulation.
Replacing the Airtac SI63 Standard Cylinder SI63X25SFTC with the SAI63X25SFTC
To replace this SI cylinder, order the SAI63X25SFTC. Verify your ISO 15552 interface dimensions, the 63 mm bore, 25 mm stroke, G3/8 port (available in PT, G, or NPT), and the FTC trunnion mounting accessory. Because this unit has the -S magnet, it supports legacy CS1-B/DS1-B sensors, while the SAI replacement uses current AirTAC switches. If you need more force, the neighboring 80 mm bore provides 2513 N push at 0.5 MPa; if less is required, the 50 mm bore offers 982 N. A plain cylinder does not hold load without live air—the cushion only decelerates. For load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25SFTC
- ✓ 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 SI63X25SFTC FAQ
Yes, the SI63X25SFTC is discontinued. The direct replacement is the SAI63X25SFTC. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 63 mm bore, 25 mm stroke, G3/8 port, and FTC mount.
This 63 mm bore double-acting cylinder uses a G3/8 air port. The thrust is 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 SAI63X25SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25SFTC replacement — usually within 7-8 hours.