This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X300STC, 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 SI63X300STC
The AirTAC SI63 Standard Cylinder SI63X300STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 300mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X300STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X300STC
- 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 SI63X300STC
The AirTAC SI63X300STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 300mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X300STC. This direct upgrade shares the exact ISO 15552 mounting interface, TC trunnion, stroke and force, fitting existing fixtures perfectly.
The SAI successor features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF and BSAI lock variants absent in the SI line. The -S magnet supports CS1-B/DS1-B sensors, while a Viton H seal raises heat resistance to 150 C.
Airtac SI63 Standard Cylinder SI63X300STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X300STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X300STC |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAI63X300STC 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 SAI63X300STC 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 SI63X300STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SI63X300STC Is Used
Pallet Diversion
Routes heavy pallets on a packaging line using the TC trunnion to handle side clearance during the 300mm travel arc.
Press Ejection
Pushes finished metal parts out of a hydraulic press, utilizing the 1559 N thrust at 0.5 MPa for reliable ejection.
Replacing the Airtac SI63 Standard Cylinder SI63X300STC with the SAI63X300STC
To replace the SI63X300STC, order the SAI63X300STC. Confirm the ISO 15552 TC trunnion mount, 63mm bore, 300mm stroke, G3/8 port, and the -S magnet for legacy CS1-B/DS1-B switches. If you need more force, the 80mm bore yields 2513 N push at 0.5 MPa; if less, the 50mm bore provides 982 N. Because this is a 300mm stroke, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X300STC
- ✓ 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 SI63X300STC FAQ
Yes, the SI63X300STC is discontinued. The direct replacement is the SAI63X300STC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 300mm stroke, G3/8 port, TC mount, and output force.
This 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, 2805 N push at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X300STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X300STC replacement — usually within 7-8 hours.