Framing connectors are made of sheet metal and are manufactured with prepunched holes to accept nails as shown in Figure 5.6 below.
They are used to provide a more positive connection between wood members by allowing the nails securing the framing connector to be loaded laterally rather than in partial withdrawl as would be the case if the members were toenailed together. They are also used in frame construction where additional protection is required against uplift from seismic or wind induced forces.
Framing connectors are suitable for most joints in wood framing of 38mm (2″ nom.) and thicker lumber. These include connections between joists and headers; rafters and plates or ridges; purlins and trusses; and studs and sill plates.
The load transfer capacity of framing connectors is affected by the thickness of steel used. Standard duty framing connectors are commonly made of 18-gauge zinc coated sheet steel.
Medium and heavy-duty anchors are made from heavier zinc-coated steel usually 12 gauge and 7 gauge respectively. They are suitable for similar connections between larger members where the loads to be carried exceed those permissible for the light anchors such as: header or beam to post; purlin to beam; and purlin to truss.
Special nails are provided with framing anchors, and the required number must be used with each anchor to provide the load carrying capacity of the anchor. Anchors are typically used in pairs to avoid eccentricity.
Figure 5.6 Framing Connectors