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Silicon Bronze Hex Bolts

Silicon bronze is a copper-silicon alloy that is often used in electrical power distribution applications. With a wide range of product options, silicon bronze carriage bolts and hex bolts are stronger than brass and provide increased corrosion resistance within a variety of applications.

At Fastener Solutions, we offer our silicon bronze bolts in both 651 and 655 grade alloys. These alloy materials are made from 95-97% copper, 2-3% silicon, and 1% manganese, providing numerous beneficial qualities based on your project’s exact specifications. Our silicon bronze carriage bolts and hex bolts are manufactured to provide the strength, stability, and corrosion protection you require.

Product Options for Silicon Bronze 655 & 651 Bolts

Whether your project requires a 651 or 655 silicon bronze hex or carriage bolt, Fastener Solutions stocks the products you need. Both silicon bronze 655 and 651 hex and carriage bolts offer unbeatable strength and durability, however, their differing silicon content dictates their direct applications.

Since 651 silicon bronze has less silicon material than 655, it is the standard material for yachts and many stock power boats. Silicon bronze 655 is a popular engineering alloy that is more suited to pump shafts, valve stems.

Sizing Options


  • 1/2"
  • 5/8”
  • 3/4"
  • 7/8”
  • 1”
  • 1 1/8”
  • 1 1/4"


  • 1 1/2" – 1 3/4"
  • 2” – 2 3/4"
  • 3” – 3 3/4"
  • 4” – 4 1/2”
  • 5” – 5 1/2"
  • 6” – 6 1/2"
  • 7” – 7 1/2"
  • 8”

Advantages of Silicon Bronze Bolt Material

As an alloy of copper and tin, silicon bronze contains a small amount of silicon, which increases the corrosion resistance within the alloy material. Since they provide enhanced strength, durability, and corrosion resistance, marine industries prefer 651 and 655 silicon bronze bolts for their projects. Additional silicon bronze nut and bolt material benefits include:

  • High thermal conductivity
  • Friction reduction
  • Minimal clearance requirement
  • Non-magnetic properties

Common Applications of Silicon Bronze Bolts

Whether it’s enhanced strength, corrosion resistance, or durability, silicon bronze hex bolts and carriage bolts provide the qualities your project requires. Silicon bronze bolts provide enhanced protection against inclement weather and saltwater conditions. Direct silicon bronze bolt applications include:

  • Marine
  • Outdoor woodworking
  • Electrical circuitry
  • Gas exposure
  • Sewage
  • Refiners
  • Power and energy
  • Minesweeping

Contact Fastener Solutions for Silicon Bronze Bolts Today

Contact us for more information regarding our silicon bronze nut and bolt product options, including 651 and 655 alloy carriage and hex bolts, or if your project requires large quantities of silicon bronze bolts. Submit a Quick Quote for direct pricing information today. Fastener Solutions is your premium supplier of high quality 651 and 655 silicon bronze carriage and hex bolts.

For large scale orders, request a quote to receive our best pricing available for your custom order.

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