This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX270, 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 SI63BX270
The AirTAC Airtac SI63 Standard Cylinder SI63BX270 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 270mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX270, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke270 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX270
- 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 SI63BX270
The AirTAC SI63BX270 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 270 mm stroke. This SKU features a SUS304 stainless piston rod (-B) for corrosion resistance, a G3/8 port, and no magnet. Because it lacks a magnet, it cannot accept a position switch.
AirTAC replaced this EOL unit with the SAI63BX270, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. For load-holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or the SAIL/BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX270 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX270 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX270 |
| Bore size | Ø63 mm |
| Stroke | 270 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 SAI63BX270 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 SAI63BX270 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 SI63BX270
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×270 | 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 SI63BX270 Is Used
Stainless Rod Actuation
Ideal for packaging lines requiring corrosion resistance, using the SUS304 rod to push 1559 N at 0.5 MPa over a 270 mm travel.
Product Diverting
Pushes items across belts at 30-800 mm/s; use a pilot-operated check valve to prevent drift when air is lost mid-stroke.
Replacing the Airtac SI63 Standard Cylinder SI63BX270 with the SAI63BX270
To replace the SI63BX270, order the SAI63BX270. Verify the ISO 15552 mounting interface, the 270 mm stroke, G3/8 port, and your mounting accessory. This SKU has a SUS304 rod (-B) and no magnet, so it cannot take CS1-B/DS1-B sensors; if you need position feedback, select an SAI model with the -S magnet option. At 0.5 MPa it pushes 1559 N; if sizing down, a 50 mm bore gives 982 N, while an 80 mm bore yields 2513 N. For this 270 mm stroke, ensure guide rails carry side loads to prevent rod bending. A plain cylinder does not hold load without live air; for secure holding, use a pilot check valve, external rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX270
- ✓ 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 SI63BX270 FAQ
Yes, the SI63BX270 is discontinued. The direct replacement is the AirTAC SAI63BX270. It shares the same ISO 15552 mounting interface, 63 mm bore, 270 mm stroke, force, G3/8 port, and SUS304 rod, fitting existing fixtures perfectly.
It has a G3/8 air port. At 0.5 MPa it pushes 1559 N and pulls 1402 N. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical max force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX270
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX270 replacement — usually within 7-8 hours.