This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X300N, 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 SI63X300N
The AirTAC SI63 Standard Cylinder SI63X300N 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 SAI63X300N, 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 → SAI63X300N
- 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 SI63X300N
The AirTAC SI63X300N is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 300 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. As an end-of-life unit, it drops out in favor of the SAI63X300N, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This NBR-sealed SKU lacks a magnet, so it cannot accept a CS1-B or DS1-B sensor.
Airtac SI63 Standard Cylinder SI63X300N Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X300N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X300N |
| 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 SAI63X300N 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 SAI63X300N 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 SI63X300N
| 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 SI63X300N Is Used
Package Diverting
Drives diverter arms on sorting lines, using the 1559 N push force at 0.5 MPa to push parcels firmly onto adjacent chutes.
Material Lowering
Acts as a descent damper for 79 kg vertical loads, relying on the 30 mm adjustable air cushions to decelerate smoothly at stroke end.
Clamp Actuation
Extends 300 mm to position large workholding clamps on machining fixtures, taking advantage of the ISO 15552 mounting interface.
Replacing the Airtac SI63 Standard Cylinder SI63X300N with the SAI63X300N
To replace the SI63X300N, order the SAI63X300N and verify your ISO 15552 mounting accessory (LB, FA, CA, TC), G3/8 port threads (PT/G/NPT), and M16x1.5 rod end. Because this is a no-magnet SKU, it cannot support position sensing; if switches are needed, select an SAI equivalent with the S suffix. If you need load holding on air loss, note that standard cushions only decelerate the piston—they do not lock it. Use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. For the 300 mm stroke, add external guides to prevent rod bending and side-load wear. If sizing up or down, a 50 mm bore gives 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X300N
- ✓ 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 SI63X300N FAQ
Yes, the SI63X300N is discontinued. The direct replacement is the SAI63X300N. It shares the same ISO 15552 mounting interface, 63 mm bore, 300 mm stroke, force, and G3/8 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G3/8 air port. It delivers 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 SAI63X300N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X300N replacement — usually within 7-8 hours.