This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X20S, 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 SI63X20S
The AirTAC Airtac SI63 Standard Cylinder SI63X20S 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 SAI63X20S, 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 → SAI63X20S
- 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 SI63X20S
The AirTAC SI63X20S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 20 mm stroke. Delivering 1559 N push force at 0.5 MPa, it is replaced by the SAI63X20S. This direct upgrade shares the same interface, port and force.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure. It adds SAIL, SAIF and BSAI variants the SI lacked. Your -S model uses CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X20S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X20S |
| 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 SAI63X20S 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 SAI63X20S 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 SI63X20S
| 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 SI63X20S Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, using its 1559 N thrust to secure components firmly within a compact 20 mm travel.
Transfer Diverters
Powers short-stroke pusher arms on packaging lines to redirect products quickly without taking up excessive footprint.
Ejector Mechanisms
Provides reliable high-force ejection of finished goods from press beds or molds, utilizing the robust 63 mm profile body.
Replacing the Airtac SI63 Standard Cylinder SI63X20S with the SAI63X20S
To replace this SI63X20S, order the SAI63X20S. Verify the ISO 15552 mounting, 20 mm stroke, G3/8 port and magnet. The 63 mm bore yields 1559 N push at 0.5 MPa; if undersized, the 80 mm bore gives 2513 N. For load holding, note the cushion only decelerates; use an external rod lock, pilot check valve, or SAIL/BSAI variant. The 20 mm stroke avoids rod-bending side-load risks.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X20S
- ✓ 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 SI63X20S FAQ
Yes, the SI63X20S is discontinued. The direct replacement is the SAI63X20S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 20 mm stroke, G3/8 port, output force and mounting accessories.
This double-acting cylinder has a G3/8 air port. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a maximum theoretical force of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X20S replacement — usually within 7-8 hours.