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How are the frames and doors prepared for the fasteners?

April 26, 2017doors fasteners frames prepared

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How are the frames and doors prepared for the fasteners?

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The thread-forming screws require a pre-drilled hole of a specified size to allow for the correct percentage of thread required for the most effective holding strength. Drill using a #13 (.185″) or 3/16″ (.188″) drill bit for metal. For wood, use a 5/32″ (.156″) drill bit. Self-drilling thread-forming screws drill and thread the hole with one operation. Both applications require the use of a center punch before drilling.