This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X450STC, 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 SI63X450STC
The AirTAC Airtac SI63 Standard Cylinder SI63X450STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 450mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X450STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke450 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X450STC
- 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 SI63X450STC
The AirTAC SI63X450STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 450 mm stroke. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is replaced by the SAI63X450STC. This direct successor matches the exact interface, bore, stroke, force, and TC trunnion mount.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. With the -S magnet, this unit supports legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X450STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X450STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X450STC |
| Bore size | Ø63 mm |
| Stroke | 450 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 SAI63X450STC 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 SAI63X450STC 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 SI63X450STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×450 | 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 SI63X450STC Is Used
Pallet Diversion
Actuates diverter arms on packaging lines to route heavy pallets, utilizing the 1559 N push force to shift loads smoothly at 0.5 MPa.
Material Pressing
Provides consistent downward pressure for assembly presses, taking advantage of the 450 mm stroke to accommodate varying part heights.
Gate Control
Operates large loading dock gates, where the TC trunnion mount handles the pivot action and the 63 mm bore delivers reliable thrust.
Replacing the Airtac SI63 Standard Cylinder SI63X450STC with the SAI63X450STC
To replace the SI63X450STC, order the SAI63X450STC. Verify the ISO 15552 TC trunnion mount, 63 mm bore, 450 mm stroke, G3/8 port (PT/G/NPT thread options), and the -S magnet for current AirTAC switch compatibility. Sizing options: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For the 450 mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X450STC
- ✓ 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 SI63X450STC FAQ
Yes, the SI63X450STC is discontinued. The direct replacement is the SAI63X450STC, which shares the same ISO 15552 mounting interface, 63 mm bore, 450 mm stroke, output force, G3/8 port, and TC mounting.
This 63 mm bore cylinder features a G3/8 air port and provides 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa it pushes 2182 N, and at 0.9 MPa it pushes 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X450STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X450STC replacement — usually within 7-8 hours.