This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX300, 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 SI63AX300
The AirTAC Airtac SI63 Standard Cylinder SI63AX300 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 SAI63AX300, 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 → SAI63AX300
- 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 SI63AX300
The AirTAC SI63AX300 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. The direct replacement is the SAI63AX300, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet and cannot take a sensor, unlike legacy CS1-B/DS1-B switches. The -A code denotes a SUS420J2 stainless rod for corrosion resistance.
Airtac SI63 Standard Cylinder SI63AX300 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX300 |
| 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 SAI63AX300 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 SAI63AX300 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 SI63AX300
| 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 SI63AX300 Is Used
Material Diversion
Drives heavy diverter gates on packaging lines, utilizing the 1559N push force to reliably redirect dense product flows at high cycle rates.
Pallet Handling
Actuates 300mm stroke lifting pins or alignment stops in automated storage systems, securely positioning loaded pallets before transfer.
Clamp Actuation
Provides robust 63mm bore clamping pressure for machining fixtures, ensuring heavy metal components remain immobile during milling operations.
Replacing the Airtac SI63 Standard Cylinder SI63AX300 with the SAI63AX300
To replace the SI63AX300, order the SAI63AX300. Confirm the ISO 15552 mounting interface, G3/8 port, M16x1.5 thread, and 300mm stroke. Since this SKU lacks -S, it cannot accept a magnetic switch. For sizing, a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Because the 300mm stroke is long, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX300
- ✓ 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 SI63AX300 FAQ
Yes, the SI63AX300 is discontinued. The direct replacement is the SAI63AX300. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 63mm bore, 300mm stroke, force, and G3/8 port, so it fits existing fixtures directly.
This double-acting cylinder features a 20mm rod, M16x1.5 thread, G3/8 port, 30mm cushion, and operates at 30-800 mm/s. Force ratings are: push 1559N and pull 1402N at 0.5MPa, push 2182N at 0.7MPa, push 2805N at 0.9MPa, with a theoretical max of 318 kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX300
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX300 replacement — usually within 7-8 hours.