This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX300SFTC, 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 SI63BX300SFTC
The AirTAC Airtac SI63 Standard Cylinder SI63BX300SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 300mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX300SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX300SFTC
- 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 SI63BX300SFTC
The AirTAC SI63BX300SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 300 mm stroke. It features a SUS304 stainless piston rod, a built-in magnet for CS1-B/DS1-B sensors, and an FTC trunnion mount. Delivering 1559 N push force at 0.5 MPa, its direct replacement is the SAI63BX300SFTC, which shares the same G3/8 port and ISO 15552 interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. If you need load holding on air loss, the plain cylinder drifts, so consider the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX300SFTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX300SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX300SFTC |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAI63BX300SFTC 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 SAI63BX300SFTC 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 SI63BX300SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SI63BX300SFTC Is Used
Stainless Rod Diverting
Actuating a divert arm on a washdown conveyor line where the SUS304 rod resists moisture and the 1559 N force reliably pushes heavy cartons.
Pallet Lift Station
Raising light pallets vertically; the 300 mm stroke provides ample travel, but an external guide is required to manage side loads during lifting.
Replacing the Airtac SI63 Standard Cylinder SI63BX300SFTC with the SAI63BX300SFTC
To replace the SI63BX300SFTC, order the SAI63BX300SFTC. It drops into existing fixtures via the identical ISO 15552 mounting interface, matching the 63 mm bore, 300 mm stroke, G3/8 port, FTC trunnion mount, and -S magnet. The -B rod material specifies SUS304 stainless steel for corrosion resistance. If sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Because the 300 mm stroke is long, use an external guide to prevent rod bending and side-load wear. Note that air cushions only decelerate; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX300SFTC
- ✓ 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 SI63BX300SFTC FAQ
Yes, the AirTAC SI63BX300SFTC is discontinued. The direct replacement is the SAI63BX300SFTC. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the exact 63 mm bore, 300 mm stroke, G3/8 port, FTC mount, and SUS304 rod.
The G3/8 port is fixed by the 63 mm bore. Force ratings are 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX300SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX300SFTC replacement — usually within 7-8 hours.