This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X1280S, 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 SI63X1280S
The AirTAC Airtac SI63 Standard Cylinder SI63X1280S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1280mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X1280S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1280 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X1280S
- 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 SI63X1280S
The AirTAC SI63X1280S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 1280 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X1280S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family expands options with SAIL, SAIF, and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X1280S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X1280S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X1280S |
| Bore size | Ø63 mm |
| Stroke | 1280 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 SAI63X1280S 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 SAI63X1280S 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 SI63X1280S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1280 | 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 SI63X1280S Is Used
Long-Stroke Diversion
Pushes heavy pallets laterally across transfer lines using the full 1280 mm travel with 1559 N force at 0.5 MPa.
Vertical Material Lift
Raises goods up to 79 kg in storage retrieval systems, requiring external guides to manage the long 1280 mm rod extension.
Multi-Station Indexing
Shifts machining fixtures between stations, benefiting from the G3/8 port and adjustable 30 mm cushions at both ends.
Replacing the Airtac SI63 Standard Cylinder SI63X1280S with the SAI63X1280S
To replace the SI63X1280S, order the SAI63X1280S direct. Confirm the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and your -S magnet requirement. If you need to size both ways, the neighbouring bores are 50 mm (982 N push @0.5) and 80 mm (2513 N push @0.5). Because this is a 1280 mm long stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X1280S
- ✓ 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 SI63X1280S FAQ
Yes, the SI63X1280S is discontinued. The direct replacement is the AirTAC SAI63X1280S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 1280 mm stroke, G3/8 port, and mounting fixtures.
The G3/8 port feeds a 20 mm rod. It delivers 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. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X1280S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X1280S replacement — usually within 7-8 hours.