Fair Wind Fasteners
Silicon Bronze Hex Flange Nut
Silicon Bronze Hex Flange Nut
Couldn't load pickup availability
651 Silicon Bronze Serrated Hex Flange Nuts
Marine Grade | UNS C65100
Secure your build with confidence using our 651 Silicon Bronze Serrated Hex Flange Nuts—the premium fastening choice for high-strength, corrosion-resistant applications in marine and coastal environments. Precision-machined from UNS C65100 silicon bronze, these flange nuts are trusted by boatbuilders, shipyards, and restoration professionals who demand uncompromising durability and performance.
Key Features:
- Material: 651 Silicon Bronze (UNS C65100)
- Integrated Flange: Distributes load evenly and eliminates the need for a washer
- Serrated Bearing Surface: Locks in place and resists vibration-backed loosening
- Thread Type: Unified National (Imperial)
- Corrosion Resistance: Outstanding in saltwater and high-moisture environments
Why Choose These Nuts?
Unlike standard flange nuts, the serrated face bites into mating surfaces, providing a mechanical lock that resists loosening due to vibration or torque cycling. Paired with a silicon bronze bolt or machine screw, these nuts form an unbeatable union that won't gall, seize, or degrade like stainless steel can in wet or dissimilar-metal conditions.
Common Uses:
- Wooden boat construction and refits
- Deck hardware installations
- Coastal architectural projects
- Outdoor furniture and copper sculpture assembly
- Anywhere vibration resistance and long-term corrosion performance are critical
Bronze Flange Nut Dimensions:

Size | Flange Diameter (FD) | Total Height (TH) |
1/4"-20 | ||
5/16"-18 | 0.659" | 0.275" |
3/8"-16 | 0.725" | 0.340" |
1/2"-13 | 1.022" | 0.455" |


