This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X20STC, 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 SI63X20STC
The AirTAC Airtac SI63 Standard Cylinder SI63X20STC 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 SAI63X20STC, 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 → SAI63X20STC
- 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 SI63X20STC
The AirTAC SI63X20STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 20 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X20STC, a direct sharing the same ISO 15552 mounting interface, bore, stroke, output force, and TC trunnion accessory.
The SAI upgrade features a refined piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the SAI family introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63X20STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X20STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X20STC |
| 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 SAI63X20STC 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 SAI63X20STC 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 SI63X20STC
| 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 SI63X20STC Is Used
Short-Stroke Clamping
Ideal for holding parts during machining operations where a compact 20 mm stroke and 1559 N force securely lock components in place.
Transfer Line Diversion
Provides rapid actuation for diverting packages or materials on a production line, utilizing the 30-800 mm/s speed range and TC trunnion mount.
Replacing the Airtac SI63 Standard Cylinder SI63X20STC with the SAI63X20STC
To replace the discontinued SI63X20STC, order the SAI63X20STC. Verify your existing fixture's ISO 15552 TC trunnion mounting, 63 mm bore, 20 mm stroke, and G3/8 port. The SAI retains the M16x1.5 rod thread and the -S magnet for current AirTAC switches (replacing legacy CS1-B/DS1-B sensors). If sizing up or down, neighbouring bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Note that a standard cylinder drifts without live air; the cushion only decelerates. For suspended loads, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X20STC
- ✓ 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 SI63X20STC FAQ
Yes, the SI63X20STC is discontinued. The direct replacement is the SAI63X20STC. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 20 mm stroke, G3/8 port, and TC mounting interface.
This 63 mm bore double-acting cylinder uses 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, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X20STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X20STC replacement — usually within 7-8 hours.