This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X20, 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 SI63X20
The AirTAC Airtac SI63 Standard Cylinder SI63X20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 20mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke20 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X20
- 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 SI63X20
The AirTAC SI63X20 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 20 mm stroke, delivering a push force of 1559 N at 0.5 MPa. It is superseded by the direct replacement SAI63X20, which shares the exact ISO 15552 mounting interface, G3/8 port, and output force. This specific SKU lacks a magnet and cannot accept a position sensor.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI63 Standard Cylinder SI63X20 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X20 |
| Bore size | Ø63 mm |
| Stroke | 20 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 SAI63X20 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 SAI63X20 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 SI63X20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×20 | 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 SI63X20 Is Used
Short-Stroke Clamping
Ideal for holding parts during machining with a robust 1559 N push force in a compact 20 mm stroke.
Divertor Gate Actuation
Provides rapid 30-800 mm/s cycling to route packages on production lines without occupying much length.
Pallet Stopper Mechanism
Delivers reliable stopping power for heavy pallets, utilizing the 1402 N pull force to retract the stop.
Replacing the Airtac SI63 Standard Cylinder SI63X20 with the SAI63X20
To replace the SI63X20, order the SAI63X20. Verify the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and your mounting accessory (LB, FA, TC, etc.). Because this SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B sensors. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa; if less force is needed, a 50 mm bore provides 982 N, while an 80 mm bore offers 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X20
- ✓ 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 SI63X20 FAQ
Yes, the SI63X20 is discontinued. The direct replacement is the AirTAC SAI63X20. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 20 mm stroke, G3/8 port, and mounting fixtures.
The 63 mm bore features a G3/8 air port. It generates 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 maximum theoretical force of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X20
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X20 replacement — usually within 7-8 hours.