This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX50SFA, 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 SI63AX50SFA
The AirTAC Airtac SI63 Standard Cylinder SI63AX50SFA 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 SAI63AX50SFA, 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 → SAI63AX50SFA
- 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 SI63AX50SFA
The AirTAC SI63AX50SFA is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 50mm stroke, SUS420J2 stainless rod, magnet, and FA flange mount. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63AX50SFA. This direct upgrade keeps the exact ISO 15552 mounting interface, bore, and output force, fitting existing fixtures perfectly.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent from the legacy SI line.
Airtac SI63 Standard Cylinder SI63AX50SFA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX50SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX50SFA |
| 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 SAI63AX50SFA 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 SAI63AX50SFA 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 SI63AX50SFA
| 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 SI63AX50SFA Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS420J2 rod to clamp parts securely with 1559N force at 0.5MPa.
Flange-Mounted Diverting
The FA flange mount handles lateral loads on packaging lines, pushing products at 30-800mm/s with reliable G3/8 air flow.
Vertical Lift Gates
Lifts light access gates or pallet stops up to 79kg safely, using the built-in magnet for position feedback at stroke ends.
Replacing the Airtac SI63 Standard Cylinder SI63AX50SFA with the SAI63AX50SFA
To replace the SI63AX50SFA, order the SAI63AX50SFA. Verify the ISO 15552 FA flange interface, 63mm bore, 50mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). The -A rod is SUS420J2 stainless steel. When sizing, note a 50mm bore offers 982N push @0.5MPa, while an 80mm bore provides 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX50SFA
- ✓ 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 SI63AX50SFA FAQ
Yes, the SI63AX50SFA is discontinued. The direct replacement is the SAI63AX50SFA, which shares the identical ISO 15552 mounting interface, 63mm bore, 50mm stroke, G3/8 port, and FA flange.
It features a G3/8 air port and M16x1.5 rod thread. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX50SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX50SFA replacement — usually within 7-8 hours.