Rivet Dome Head
A tri-fold rivet — also called a peel or split rivet — is how you attach hardware to a sealed kayak hull when you cannot get a hand inside to hold a nut.
How a Tri-Fold Rivet Differs From an Ordinary Pop Rivet
Any pop rivet sets by pulling a mandrel through a hollow body until the blind end deforms. A standard rivet rolls into a small hard button barely wider than the hole.
A tri-fold rivet has a body pre-scored into three segments. As the mandrel pulls, those segments split and fold flat against the back face, opening into a three-legged star two to three times the hole diameter.
Why a Tri-Fold Rivet Suits a Plastic Kayak
Two reasons, and both matter.
First, a rotomoulded hull is a sealed single skin — you cannot reach behind most of it to hold a nut, so the fastener has to set entirely from outside.
Second, polyethylene is soft and it creeps. A screw or a standard rivet concentrates its load on a small ring, and under sun and sustained load the plastic slowly flows out from under it until the joint goes loose. The tri-fold's star spreads that same load over a much larger area, so it stays put.
There is nothing to vibrate loose and no nut to drop inside the hull.
The Trade-Off, Honestly
It is permanent. Removing a tri-fold rivet means drilling it out. If the fitting might need to come off later — a fish finder mount, anything you may reposition — use a machine screw through a well nut instead. We stock those too.
Details
• Tri-fold (peel) pop rivet, dome head
• Aluminium body and mandrel, black powder-coated
• 3/16", drill a 3/16" hole
• Grip range 1/32" to 1/2"
• 10 per pack
• Sets with a standard hand riveter — no special tool
At our Clearwater shop.
