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D rings in most cases are made from a solid “D” of metal or a bent piece of wire wrapped in a sheave of thin metal with an opening or openings punched in it for screw holes. There are solid D rings on the market, though these are limited in their usage because they don’t have a hinging behavior that is otherwise present in the 2 piece standard version. D rings are used to hang frames. They are either used to hang a picture directly onto a hook, or to act as the anchor points to a cord or chain. When they are used to hang directly on a fastener in the wall, they are screwed or stapled into the back of the frame at a specific height. The screws on which they will hang, are then put into the wall at an exact position so that they line up with the D rings in the frame. Now when the frame is held over these hooks or screws in the wall they will line up exactly and the D rings can be pushed over the hook to hold the weight of the frame. The screws can just as easily be put in before the D rings, though checking that the D rings are secure in the frame before putting a hole in the wall can be a good idea.
This method is a very permanent way of hanging pictures with D rings as there will be deep holes in the wall, and there is little room to make adjustments or alterations.
It is a very strong method of hanging very heavy or delicate mouldings. This is because the D rings are only exerting an upward force on the structure of the frame, meaning there is no lateral crushing that can occur when using cord. When hanging D rings by way of a cord, they simply act as an anchor to tie or crimp the cord to the frame. This is then fed over a hook in the wall or held on picture rails. In galleries, a gallery hanging system is often used to improve flexibility of hanging multiple shows. When these hanging systems are used, the hook is fed through the D ring and can be adjusted to get the picture hanging level.When using D rings it is a good idea to not have them too close to the outside edge of the frame as they can become visible. On very narrow frames this is unavoidable and may have to be accepted.
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