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Fence Middle Post Name Term?

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Half of our fence nearly toppled over during the last strong winds few months back/last year. The section which just has timber posts and little to no support so will be torn down and redone properly with concrete posts etc. However the front section half already has concrete posts and bricks so don't really want to redo it as it's solid except for replacing the fence for a new one.

I can't find the name for the middle wood part which slots into the concrete posts to hold the fence? Also can new one just be added/slotted in as can't really figure out how that would be done as this is different to just dropping one in (sliding) from the top with the concrete posts that have a groove.

Any help appreciated as always!
 

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If you mean the triangular cut timber, those are known as arris rails which are becoming a thing of the past. Most commercially produced panels these days are built on squared off battens to keep costs lower.
 
If you mean the triangular cut timber, those are known as arris rails which are becoming a thing of the past. Most commercially produced panels these days are built on squared off battens to keep costs lower.
Appreciated, just had a look online. So I guess in order to get a new fence in, would have to get an arris bracket as well, the metal part would stick into the groove whilst then drilling the bracket onto the arris rail timber?
 
There are different sorts of fencing.

Solid panels like this
which is what @Scally-Ho was referring to. They are attached to fence posts, often posts that have a slot on each side.

What you have is feather edge boards like this
and for those an arris rail is essential.

However what you have are an older type of arris rail that is mortised into the fence post. Nowadays arris rails are cut square and are attached to the fence post using arris rail brackets like this

They are designed to be screwed (nailed) to the arris rail and to the surface of a wooden fence post.

It might be possible to screw an arris rail bracket to a concrete fence post by drilling holes and putting in rawl plugs, like one would do on a solid wall. However I would be reluctant to try this. Concrete is relatively brittle and the fence post might just break. Also they often have steel reinforcing in them and you could hit that.

In your position I would be tempted to cut a piece of wood to fit the hole in the concrete fence post, hammer that in and then screw a piece of wood to each end of it, so you have a piece of wood on each side of the fence post. Then you can attach the arris rails to those pieces of wood.
 

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