This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X1390S, 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 SI63X1390S
The AirTAC Airtac SI63 Standard Cylinder SI63X1390S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1390mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X1390S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1390 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X1390S
- 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 SI63X1390S
The AirTAC SI63X1390S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 1390 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X1390S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds variants the SI lacked, like the SAIL air-released lock and BSAI clamp-lock.
Because this is a 1390 mm extended stroke, external guides are strongly recommended to prevent rod bending and side-load damage. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors; the SAI replacement uses current AirTAC switches. A plain cylinder will not hold a load without live air, as the cushion only decelerates near stroke end.
Airtac SI63 Standard Cylinder SI63X1390S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X1390S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X1390S |
| Bore size | Ø63 mm |
| Stroke | 1390 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 SAI63X1390S 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 SAI63X1390S 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 SI63X1390S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1390 | 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 SI63X1390S Is Used
Long-Stroke Transfer
Pushes workpieces between machining centers over a 1390 mm span, relying on external guides to prevent rod sag.
Vertical Material Lift
Raises a 79 kg load using the 63 mm bore, requiring a pilot check valve to prevent drifting down on air loss.
Automated Clamping
Actuates large fixture clamps with 1559 N force, using the built-in magnet for end-of-stroke confirmation.
Replacing the Airtac SI63 Standard Cylinder SI63X1390S with the SAI63X1390S
To replace the SI63X1390S, order the SAI63X1390S. Confirm the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and your mounting accessory (LB, FA, CA, TC). The -S magnet is required for switch sensing. For load holding without live air, use an external rod lock or pilot check valve, or step up to the SAIL/BSAI lock variants. At 1390 mm, add external guides to prevent rod bending. Sizing both ways: dropping to a 50 mm bore yields 982 N push @0.5 MPa, while stepping up to an 80 mm bore provides 2513 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X1390S
- ✓ 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 SI63X1390S FAQ
Yes, the SI63X1390S is discontinued. The direct replacement is the AirTAC SAI63X1390S. It shares the same ISO 15552 mounting interface, 63 mm bore, 1390 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G3/8 air port. Force output 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. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X1390S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X1390S replacement — usually within 7-8 hours.