This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X40FA, 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 SI63X40FA
The AirTAC Airtac SI63 Standard Cylinder SI63X40FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X40FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X40FA
- 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 SI63X40FA
The AirTAC SI63X40FA is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 40 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X40FA, a direct upgrade retaining the exact FA flange mounting, M16x1.5 rod thread, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X40FA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X40FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X40FA |
| Bore size | Ø63 mm |
| Stroke | 40 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 SAI63X40FA 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 SAI63X40FA 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 SI63X40FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×40 | 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 SI63X40FA Is Used
Short-Stroke Clamping
Ideal for securing heavy workpieces in machining fixtures where a compact 40 mm stroke provides rapid, high-force clamping at 1559 N.
Ejector Stations
Delivers positive ejection of parts from automated machinery, utilizing the FA flange mount for rigid body attachment under dynamic loads.
Replacing the Airtac SI63 Standard Cylinder SI63X40FA with the SAI63X40FA
To replace the SI63X40FA, order the SAI63X40FA. Verify the ISO 15552 FA flange interface, 63 mm bore, 40 mm stroke, and G3/8 port (available in PT, G, or NPT). Because this SKU has no magnet, it cannot support position sensing; if switches are needed, specify an SAI with the S suffix. If sizing up or down, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. For load holding, remember a standard cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or explore the SAIL or BSAI lock variants for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X40FA
- ✓ 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 SI63X40FA FAQ
Yes, the AirTAC SI63X40FA is discontinued. The direct replacement is the SAI63X40FA. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 40 mm stroke, FA flange mount, G3/8 port, and output force, so it fits existing fixtures perfectly.
The 63 mm bore features a G3/8 air port, a 20 mm rod, and M16x1.5 thread. Forces are: 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 max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X40FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X40FA replacement — usually within 7-8 hours.