This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX280, 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 SI63AX280
The AirTAC Airtac SI63 Standard Cylinder SI63AX280 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 SAI63AX280, 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 → SAI63AX280
- 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 SI63AX280
The AirTAC SI63AX280 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 280mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63AX280, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. The -A designation indicates a SUS420J2 stainless steel piston rod for corrosion resistance.
Airtac SI63 Standard Cylinder SI63AX280 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX280 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX280 |
| 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 SAI63AX280 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 SAI63AX280 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 SI63AX280
| 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 SI63AX280 Is Used
Clamp Actuation
Secures heavy machining fixtures using the 1559 N push force, with the SUS420J2 stainless rod resisting coolant spray.
Package Diverters
Drives 280mm stroke diverting arms on packaging lines, benefiting from the direct SAI replacement during maintenance.
Material Lift Gates
Raises and lowers pneumatic flow gates where the 79 kg vertical lift capacity easily handles the gate weight.
Replacing the Airtac SI63 Standard Cylinder SI63AX280 with the SAI63AX280
To replace the SI63AX280, order the SAI63AX280 and verify the ISO 15552 mounting interface, 63mm bore, 280mm stroke, and G3/8 port. Confirm your mounting accessory (LB, FA, TC, etc.) and note that this non-magnetic SKU cannot support position sensing. For sizing, the 63mm bore yields 1559 N push at 0.5 MPa; if less force is needed, a 50mm bore provides 982 N, while an 80mm bore offers 2513 N. Because the 280mm stroke exceeds 300mm is false here, but always ensure adequate guide support to prevent rod bending under side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX280
- ✓ 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 SI63AX280 FAQ
Yes, the AirTAC SI63AX280 is discontinued. The direct replacement is the SAI63AX280. It shares the identical ISO 15552 mounting interface, 63mm bore, 280mm stroke, force, and G3/8 port, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. It generates 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 SAI63AX280
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX280 replacement — usually within 7-8 hours.