This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X300, 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 SI63X300
The AirTAC Airtac SI63 Standard Cylinder SI63X300 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 SAI63X300, 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 → SAI63X300
- 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 SI63X300
The AirTAC SI63X300 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 300mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X300 direct upgrade, retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size for existing fixtures.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This non-magnet SKU cannot accept a sensor, though legacy -S versions used CS1-B/DS1-B switches.
Airtac SI63 Standard Cylinder SI63X300 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X300 |
| 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 SAI63X300 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 SAI63X300 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 SI63X300
| 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 SI63X300 Is Used
Package Diversion
Actuates routing gates on packaging lines where the 1559N push force at 0.5MPa easily deflects standard totes.
Pallet Handling
Drives 300mm stroke stops and lifts in automated storage systems, utilizing the ISO 15552 mounting interface.
Replacing the Airtac SI63 Standard Cylinder SI63X300 with the SAI63X300
To replace the discontinued SI63X300, order the SAI63X300 direct: it matches the ISO 15552 mounting interface, 63mm bore, 300mm stroke, M16x1.5 rod thread, and G3/8 port. Confirm your mounting accessory (LB, FA, TC, etc.) and thread standard (PT/G/NPT). Since this SKU lacks the -S magnet, it cannot support position sensing; if sensing is needed, order the SAI63X300S and use current AirTAC switches. Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider the SAIL lock, BSAI clamp-lock, or an external pilot check valve. At 300mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X300
- ✓ 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 SI63X300 FAQ
Yes, the SI63X300 is discontinued. The direct replacement is the AirTAC SAI63X300. It is a true ISO 15552 profile cylinder with the same 63mm bore, 300mm stroke, output force, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
The 63mm bore uses a G3/8 port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI63X300
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X300 replacement — usually within 7-8 hours.