Dome Head Tri-Fold Rivets
What are dome head tri-fold rivets? Dome head tri-fold rivets combine the standard low profile rounded head with a body that splits into three legs as it sets, folding outward into a wide footprint on the blind side. That folding action is what separates them from ordinary blind rivets: instead of compressing into a tight ring behind the panel, the legs spread load across a much larger area, so they hold in thin, soft, and elongated holes. Most are supplied with a sealing washer under the head. AlbanyCountyFasteners.com stocks dome head tri-fold rivets in aluminum and steel, in 3/16 and 1/4 inch.
When should I use a dome head tri-fold rivet?
When you need the tri-fold blind side but not the shaved finish. The three legged formation is the reason to buy any tri-fold rivet: it grips thin panel and worn holes far better than a standard rivet, and it will hold where a conventional blind rivet pulls through. The head style is a separate decision. A dome head is the straightforward choice, giving a clean rounded profile that installs in one step with no finishing work. Choose the shave head instead only when the finished rivet has to match solid buck rivets in the surrounding panel, since that match costs you two extra operations per rivet. For most panel and repair work, the dome head is what you want.
Why choose dome head tri-fold rivets
- Three folding legs spread load over a wide blind side footprint
- Holds in thin, soft, and elongated holes where standard rivets pull through
- Standard dome profile installs in one step with no finishing required
- Sealing washer under the head gives a weather resistant joint
- Available in aluminum and steel to match the panel material
Material options
- Aluminum with aluminum mandrel, for aluminum panels, with no dissimilar metal in the joint
- Steel with steel mandrel, higher strength for steel panels and heavier duty repair
- Match the rivet material to the panel wherever moisture is a factor
Common applications
- Trailer, truck body, and RV exterior panels
- Metal building panel and siding work
- Thin gauge sheet where a standard rivet would pull through
- Repairs over holes that have elongated or enlarged
- Fiberglass, composite, and soft substrate panels
- Weather exposed joints where the sealing washer adds protection
If the finished head must match solid buck rivets, use shave head tri-fold rivets instead. For a lower finished profile without shaving, see low profile flat head tri-fold rivets.
Related Categories
- Tri-Fold Rivets
- Shave Head Tri-Fold Rivets
- Recessed Crown Dome Head Tri-Fold Rivets
- Low Profile Flat Head Tri-Fold Rivets
- Rivet Washers
Dome Head Tri-Fold Rivet FAQs
Are tri-fold rivets structural?
No, they are non-structural. They are chosen for holding power in thin and soft material rather than for shear capacity. If you need higher shear or tensile values, use structural blind rivets instead.
What makes the body fold into three legs?
The body is scored so it splits predictably under the mandrel pull. As the mandrel draws through, the body separates along those lines and the three sections fold outward flat against the back surface, rather than compressing into a ring.
Do these work in oversized holes?
Better than most rivets, yes. The wide leg footprint bridges a hole that has enlarged. If the hole is badly oversized, step up a rivet diameter or add a backing washer rather than relying on the legs alone.
Aluminum or steel?
Match the panel. Aluminum for aluminum skins, avoiding any galvanic couple. Steel for steel panels and where you need more strength. Mixing metals with moisture present will corrode the less noble one around every hole.
Is the sealing washer necessary?
It gives a watertight seal under the head, which matters on exterior panels. For interior work it is not essential but does no harm. Remember the washer thickness counts toward your grip range calculation.
Can I set these with a standard rivet tool?
Yes. No special nosepiece is required, though the larger formation means a longer pull, so use a tool with full stroke travel. Steel at 1/4 inch benefits from a lever or pneumatic tool.