A frangible pin is a deformable device which will cause a cross-country fence to collapse when loaded with a total of 15 kilonewtons (7.5 kN on each pin).

What is a frangible pin in eventing?

The frangible pins sit under the rail (one at each side) and are designed to break when a certain force is applied to the rail; for example, in the event of a horse impacting a fence, it will allow the rail to drop, thus reducing the risk of a rotational horse fall.

What is a frangible device?

Frangible devices allow cross-country fences to collapse under both forward and upward pressure and are designed to prevent rotational falls, which can cause serious injuries to horses and riders.