This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125FA, 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 SI63X125FA
The AirTAC Airtac SI63 Standard Cylinder SI63X125FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X125FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X125FA
- 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 SI63X125FA
The AirTAC SI63X125FA is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 125mm stroke. Delivering 1559N push force at 0.5MPa, it is replaced by the SAI63X125FA direct, retaining the same G3/8 port, M16x1.5 rod thread, and FA flange mounting interface. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Without a magnet, this specific SKU cannot accept a position switch.
The SAI family also adds the SAIL air-released lock, SAIF integrated 4M valve, and BSAI clamp-lock variants absent from the legacy SI line. Note that a standard cylinder drifts on air loss; the 30mm cushions only decelerate near stroke end, so use a pilot check valve for load holding.
Airtac SI63 Standard Cylinder SI63X125FA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125FA |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAI63X125FA 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 SAI63X125FA 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 SI63X125FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SI63X125FA Is Used
Clamp Actuation
Provides 1559N of clamping force at 0.5MPa for securing mid-sized workpieces during machining operations.
Package Diverting
Uses the 125mm stroke to push cartons off a main conveyor belt line into secondary packaging lanes.
Vertical Pressing
Applies up to 2805N at 0.7MPa for light-duty pressing or seating tasks, requiring external load holding.
Replacing the Airtac SI63 Standard Cylinder SI63X125FA with the SAI63X125FA
To replace the SI63X125FA, order the SAI63X125FA, which is dimensionally interchangeable per ISO 15552. Confirm the FA flange accessory, 125mm stroke, G3/8 port, and PT/G/NPT thread preference. Since this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. For loads, the 63mm bore yields 1559N push and 1402N pull at 0.5MPa; if undersized, the 80mm bore offers 2513N push. A plain cylinder does not hold load without live air, so for vertical restraint consider the SAIL lock variant or an external rod lock. The 125mm stroke is well within limits, but always guide external rods to prevent side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125FA
- ✓ 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 SI63X125FA FAQ
Yes, the SI63X125FA is discontinued. The direct replacement is the SAI63X125FA. It shares the same ISO 15552 mounting interface, 63mm bore, 125mm stroke, output force, G3/8 port, and FA flange mount, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 air port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and 2805N push at 0.9MPa, with a theoretical max of 318kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X125FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125FA replacement — usually within 7-8 hours.