This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX275S, 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 SI63BX275S
The AirTAC Airtac SI63 Standard Cylinder SI63BX275S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 275mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX275S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke275 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX275S
- 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 SI63BX275S
The AirTAC SI63BX275S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 275mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63BX275S, which matches the exact bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures.
This specific unit features a SUS304 stainless piston rod for corrosion resistance and a built-in magnet for CS1-B/DS1-B sensors. The SAI upgrade uses an improved piston seal with two Y-shaped elements for lower start-up pressure.
Airtac SI63 Standard Cylinder SI63BX275S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX275S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX275S |
| Bore size | Ø63 mm |
| Stroke | 275 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 SAI63BX275S 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 SAI63BX275S 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 SI63BX275S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×275 | 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 SI63BX275S Is Used
Stainless Rod Actuation
Drives 275mm stroke mechanisms in washdown or mildly corrosive environments using the SUS304 piston rod.
Mid-Range Material Diverting
Routes packages on lines by pushing or lifting loads up to 935N safely at 0.5MPa operating pressure.
Guided Vertical Lifting
Raises fixtures or pallets up to 79kg through 275mm of travel when paired with external load guides.
Replacing the Airtac SI63 Standard Cylinder SI63BX275S with the SAI63BX275S
To replace the SI63BX275S, order the SAI63BX275S. Verify the ISO 15552 mounting interface, 63mm bore, 275mm stroke, G3/8 port, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Keep the SUS304 (-B) rod option for wet environments. At 0.5MPa it yields 1559N push and 1402N pull; if undersized, the 80mm bore gives 2513N push. For loads needing 275mm of travel, add external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX275S
- ✓ 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 SI63BX275S FAQ
Yes, the AirTAC SI63BX275S is discontinued. The direct replacement is the SAI63BX275S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 275mm stroke, G3/8 port, and SUS304 rod.
It uses a G3/8 air port. The force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX275S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX275S replacement — usually within 7-8 hours.