This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX280, 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 SI63BX280
The AirTAC Airtac SI63 Standard Cylinder SI63BX280 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 SAI63BX280, 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 → SAI63BX280
- 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 SI63BX280
The AirTAC SI63BX280 is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 280 mm stroke, and a SUS304 stainless steel piston rod for corrosion resistance. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63BX280, which matches the original ISO 15552 mounting interface, bore, stroke, output force, and port size exactly.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. Note this no-magnet SKU cannot accept a sensor. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX280 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX280 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX280 |
| 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 SAI63BX280 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 SAI63BX280 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 SI63BX280
| 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 SI63BX280 Is Used
Washdown Clamping
Ideal for food or chemical fixtures where the SUS304 stainless rod resists moisture while providing 1559 N of secure clamping force at 0.5 MPa.
Package Diversion
Drives 280 mm diverting arms on packaging lines, moving loads safely under the 935 N working load threshold without requiring magnetic sensing.
Vertical Lift Gates
Lifts lightweight access gates or material trays up to 79 kg, relying on the adjustable 30 mm air cushions to decelerate smoothly at stroke ends.
Replacing the Airtac SI63 Standard Cylinder SI63BX280 with the SAI63BX280
To replace the discontinued SI63BX280, order the SAI63BX280. It is a direct per the ISO 15552 mounting interface, keeping the 63 mm bore, 280 mm stroke, G3/8 port, and M16x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and note this -B configuration uses a SUS304 stainless rod. Because this SKU lacks a magnet, it cannot take a sensor; if position feedback is required, switch to an -S SAI variant and use current AirTAC switches. For sizing, neighbouring bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push). At 280 mm stroke, ensure your mechanics guide the load to prevent rod-bending side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX280
- ✓ 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 SI63BX280 FAQ
Yes, the SI63BX280 is discontinued. The direct replacement is the SAI63BX280. It matches the ISO 15552 mounting interface, 63 mm bore, 280 mm stroke, force, and G3/8 port, so it drops directly into existing fixtures.
The bore is 63 mm with 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 max of 318 kgf at 1.0 MPa. The rod thread is M16x1.5.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX280
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX280 replacement — usually within 7-8 hours.