The picture above is a montage made to attest to the strength of the keyholes on our brackets. We placed 1 (one) 1 1/2" x #10 Pan Head Screw in an upright 4 x 4. Attached was a 1/4" piece of plywood to the top of one of our 7/8" thick bracket for a platform for the bricks to sit on. Only the top keyhole was used to attach the bracket to the screw on the post. After stacking the bricks, slightly less than 5 pounds average, until 10 bricks were stacked on which weighed almost 48 pounds total. Most of our larger brackets have a second keyhole to use if more secure hanging is needed. They can also be used just to keep the brackets vertical. More could have been stacked on them but this is more weight than most anyone would put on one bracket much less only using one keyhole. The smallest brackets we make only have one keyhole. If you are installing on drywall or other surfaces, there are many types of anchors that can be purchased locally that will securely fasten the brackets. See our tip below for a recommendation on installation.
The brackets are made to handle heavy loads. For a more secure installation, you would install a small strip of wood fastened to the wall, a back-plate, between the brackets on wall directly under the back side of the shelf as noted in the drawing below. This will help to keep the shelf from bowing and sagging in the middle over time as well as adding extra support overall. You would fasten the shelf to the brackets as well as the back-plate you install. For example, all of our Custom Assembled shelf units will have back-plates to to make them a solid unit.
We are The Shelf Factory and we make a wide assortment of Wood Shelf Brackets, Wood Corbels, Wood Curtain Brackets, Wood Plate Rails, Wood Gun Brackets and even will customize them.
Here is an answer to a question we have received many times. Why do we only use Southern Yellow Pine to make our items?. Answer: We make our all our Wood Shelves and Wood Shelf Brackets out of Beautiful Southern Yellow Pine (SYP). We use only Southern Yellow Pine, a highly renewable wood (quick harvest/growing) which is the hardest of the evergreen species and is comparable to Oak or many other hard-woods in strength. Southern Yellow Pine is so strong it is used for superior building lumber, utility poles, treated decking lumber, high quality trim/mouldings and anywhere strength is needed or preferred. Do not confuse this for species of White pines such as Fir, Spruce etc. as they are a lightweight and softer wood is not the material I use for brackets or shelving. All the pictures, including all of the stained and finished units are a made from (SYP).
We make our brackets in many styles and purposes, Wood Fan Brackets, Curtain Brackets, Gun / Rifle Brackets, Corbels, even some unusual custom items.