This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX1720S, 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 SI63BX1720S
The AirTAC Airtac SI63 Standard Cylinder SI63BX1720S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1720mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX1720S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1720 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX1720S
- 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 SI63BX1720S
The AirTAC SI63BX1720S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 1720 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. Because 1720 mm exceeds the 1500 mm standard maximum for this bore, this unit is a non-standard, made-to-order configuration. The direct replacement is the SAI63BX1720S, matching the interface, force, port, and mounting.
This specific unit includes a SUS304 stainless piston rod (-B) for corrosion resistance and a magnet (-S) for legacy CS1-B/DS1-B switches. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts on air loss; for load holding, use an external rod lock or the SAIL/BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX1720S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX1720S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX1720S |
| Bore size | Ø63 mm |
| Stroke | 1720 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 SAI63BX1720S 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 SAI63BX1720S 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 SI63BX1720S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1720 | 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 SI63BX1720S Is Used
Long-Stroke Material Push
Ideal for transferring heavy workpieces across wide conveyor gaps using its 1559 N push force at 0.5 MPa over the extended 1720 mm travel.
Automated Pallet Handling
Drives long-travel pallet stops or diverters, requiring external guide rails to prevent rod bending on this 1720 mm non-standard stroke.
Replacing the Airtac SI63 Standard Cylinder SI63BX1720S with the SAI63BX1720S
To replace the discontinued SI63BX1720S, order the SAI63BX1720S. It drops into existing fixtures per the ISO 15552 mounting interface dimensions, preserving the 63 mm bore, 1720 mm stroke, G3/8 port, and M16x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and that the -S magnet and -B SUS304 rod are specified. Because this 1720 mm stroke exceeds the 1500 mm standard maximum, it is made-to-order; at this length, prevent rod bending by guiding the load externally to avoid side loads. If you need to size both ways, a 50 mm bore gives 982 N push at 0.5 MPa, while an 80 mm bore gives 2513 N. A plain cylinder does not hold load without live air (the cushion only decelerates), so for holding use a pilot check valve or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX1720S
- ✓ 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 SI63BX1720S FAQ
Yes, the SI63BX1720S is discontinued. The direct replacement is the SAI63BX1720S. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 63 mm bore, 1720 mm stroke, G3/8 port, and output force. The SAI uses an upgraded two Y-shaped piston seal for lower start-up pressure.
The bore is 63 mm with a G3/8 air port and M16x1.5 rod thread. 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 SAI63BX1720S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX1720S replacement — usually within 7-8 hours.