This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX270S, 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 SI63BX270S
The AirTAC Airtac SI63 Standard Cylinder SI63BX270S 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 SAI63BX270S, 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 → SAI63BX270S
- 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 SI63BX270S
The AirTAC SI63BX270S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 270 mm stroke, G3/8 port, and a SUS304 stainless steel rod. It delivers 1559 N push force at 0.5 MPa. The direct replacement is the SAI63BX270S, matching the bore, stroke, force, port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The built-in magnet supports legacy CS1-B/DS1-B sensors, while a plain cylinder drifts on air loss since cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX270S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX270S |
| 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 SAI63BX270S 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 SAI63BX270S 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 SI63BX270S
| 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 SI63BX270S Is Used
Stainless Rod Clamping
Uses the SUS304 rod for corrosion resistance when clamping machined parts in humid wash-down cells.
Mid-Stroke Diversion
270 mm travel pushes product lanes across transfer belts using 1559 N thrust at 0.5 MPa.
Replacing the Airtac SI63 Standard Cylinder SI63BX270S with the SAI63BX270S
To replace the SI63BX270S, order the SAI63BX270S and confirm the ISO 15552 interface, 63 mm bore, 270 mm stroke, G3/8 port, and mounting accessory. The -B rod is SUS304 stainless steel and the -S magnet works with CS1-B/DS1-B switches. For sizing, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Because the 270 mm stroke exceeds 300 mm, ensure guide rails prevent rod bending under side loads. Note that a plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX270S
- ✓ 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 SI63BX270S FAQ
Yes, the SI63BX270S is discontinued. The direct replacement is the SAI63BX270S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 270 mm stroke, G3/8 port, and mounting interface.
The G3/8 port bore delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX270S replacement — usually within 7-8 hours.