This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X280S, 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 SI63X280S
The AirTAC Airtac SI63 Standard Cylinder SI63X280S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 280mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X280S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke280 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X280S
- 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 SI63X280S
The AirTAC SI63X280S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 280mm stroke, delivering 1559N push force at 0.5MPa through its G3/8 port. It is replaced by the SAI63X280S, a direct upgrade retaining the exact mounting interface, bore, stroke, and output force.
The SAI upgrade features a new 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 the SI lacked.
Airtac SI63 Standard Cylinder SI63X280S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X280S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X280S |
| Bore size | Ø63 mm |
| Stroke | 280 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 SAI63X280S 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 SAI63X280S 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 SI63X280S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×280 | 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 SI63X280S Is Used
Package Diversion
Actuates routing gates on 200-300mm strokes to redirect medium-weight cartons on packaging lines.
Clamp Actuation
Provides 1559N of push force at 0.5MPa to secure workpieces during machining or assembly operations.
Vertical Lift Stops
Raises product stops or lifting platforms up to 280mm, safely handling vertical loads near 79kg.
Replacing the Airtac SI63 Standard Cylinder SI63X280S with the SAI63X280S
To replace the SI63X280S, order the SAI63X280S, confirming the ISO 15552 interface, 63mm bore, 280mm stroke, G3/8 port, and magnet for position sensing. Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. For this 280mm stroke, ensure adequate guide support to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve. The SI uses CS1-B/DS1-B sensors, while the SAI takes current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X280S
- ✓ 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 SI63X280S FAQ
Yes, the SI63X280S is discontinued. The direct replacement is the SAI63X280S, which maintains the same ISO 15552 mounting interface, 63mm bore, 280mm stroke, output force, and G3/8 port.
It features a G3/8 air port and provides 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a maximum theoretical force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X280S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X280S replacement — usually within 7-8 hours.