Copper Dome Head Open End Rivets with Brass Mandrel

When do I need a copper rivet?

Three situations, and they are all fairly specific. Electrical work is the most technical: copper conducts far better than steel or stainless, so where a rivet forms part of a current path or a grounding connection, the material matters functionally rather than cosmetically. Restoration and heritage work is the second, since copper rivets are what was originally used on copper roofing, gutters, weathervanes, and period metalwork, and a stainless replacement will look wrong and can drive galvanic corrosion in the surrounding copper. The third is decorative, where the warm color and the patina copper develops over years are the reason for choosing it. Outside those cases, aluminum or stainless is usually the better value.

Why choose copper with a brass mandrel

• Copper and brass sit close together galvanically, so the fastener stays consistent
• Excellent electrical conductivity for grounding and current carrying joints
• Compatible with copper sheet, gutter, and roofing without driving corrosion
• Weathers to a natural patina instead of rusting
• Correct material for restoration and heritage metalwork

Copper and brass together

• Brass is a copper alloy, so the mandrel remnant left inside the rivet is closely matched to the body
• Avoids the corrosion and staining that a steel mandrel would introduce into a copper joint
• Preferred where the installation is exposed and expected to age visibly
• The right choice for copper roofing, flashing, and gutter work

Common applications

• Copper roofing, flashing, gutters, and downspouts
• Electrical grounding straps and current carrying connections
• Restoration of historic metalwork and architectural features
• Weathervanes, cupolas, and decorative copper fabrication
• Craft, instrument, and specialty metalwork
• Any joint where a steel or stainless rivet would corrode the surrounding copper

The alternative pairing is a copper body with a steel mandrel, which costs less but leaves a dissimilar metal inside the joint. For general work outside copper applications, open end rivets in aluminum or stainless are more economical.

Related Categories

• Dome Head Open End Rivets
• Copper Dome Head Rivets, Steel Mandrel
• Open End Rivets
• Rivet Tools
• Rivet Products

Copper Rivet FAQs

Why use a brass mandrel instead of steel?

Because the mandrel head stays inside the rivet permanently. Brass is a copper alloy and sits close to copper galvanically, so nothing inside the fastener drives corrosion. A steel mandrel in a copper body will rust in wet service and stain the copper around it.

Will copper rivets turn green?

Exposed copper develops a patina over time, moving through brown tones toward the familiar green verdigris in weathering conditions. On a copper roof or gutter that is usually desirable, since the rivets age with the surrounding metal instead of standing out.

Can I use copper rivets with steel or aluminum?

Not in wet conditions. Copper is significantly more noble than both, so steel or aluminum in contact with copper corrodes aggressively where moisture is present. Copper rivets belong in copper and brass work, or in dry indoor assemblies.

Are copper rivets strong?

Modest. Copper is softer than steel or stainless, so shear and tensile values are lower. These are chosen for conductivity, compatibility, and appearance rather than load capacity. Where strength is the priority, use stainless.

Do copper rivets conduct electricity well?

Yes, far better than steel or stainless, which is why they appear in grounding and current carrying joints. If conductivity across the joint is functional rather than incidental, copper is the material to specify.

What sizes are available?

Our copper rivets are stocked in 1/8 inch, in grip ranges covering thin sheet through moderate stacks. If you need another diameter for a restoration or electrical job, contact us with your grip requirement.