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Old 12-26-2013, 07:27 PM   #1
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Securing security door screws with just a 3/16" drill bit?


I've just purchased one of those metal security screen doors they sell at home depot. The door has these heavy 4" one way screws to fasten the jambs to the studs. The instructions state to use 3/16" drill to pre drill the holes, but the one way screws are much bigger.

I'll follow instructions, but when I pre drill screw holes I usually make the holes at least as big as the screw body. Have any of you guys installed these security doors? Do these instructions make sense?

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Old 01-02-2014, 02:54 PM   #2
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Securing security door screws with just a 3/16" drill bit?


When screwing through the jamb face AND into the rough bucks, it is best that the screw threads "grip" BOTH the jamb wood and the rough buck.

To achieve a grip in wood pre-drilled hole diameter should be smaller than the outside diameter of the screw threads (not equal). This diameter is approximately equal to the "minor diameter" of the screw which is measured root-to-root of the threads, not the "major diameter" which is measured crest-to-crest of the threads.

There are other situations where two pieces of wood are apart and need to be pulled together. Such is the case with decking and bowed lumber. Here, the top wood hole diameter should be drilled equal to the major diameter of the screw and the back wood hole diameter drilled equal to the minor diameter of the screw. The screw then "slips" in the top hole and grips in the back hole drawing the two together.

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Old 01-02-2014, 04:53 PM   #3
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Securing security door screws with just a 3/16" drill bit?


Quote:
Originally Posted by Arkitexas View Post
When screwing through the jamb face AND into the rough bucks, it is best that the screw threads "grip" BOTH the jamb wood and the rough buck.

To achieve a grip in wood pre-drilled hole diameter should be smaller than the outside diameter of the screw threads (not equal). This diameter is approximately equal to the "minor diameter" of the screw which is measured root-to-root of the threads, not the "major diameter" which is measured crest-to-crest of the threads.

There are other situations where two pieces of wood are apart and need to be pulled together. Such is the case with decking and bowed lumber. Here, the top wood hole diameter should be drilled equal to the major diameter of the screw and the back wood hole diameter drilled equal to the minor diameter of the screw. The screw then "slips" in the top hole and grips in the back hole drawing the two together.
This picture depicts what Arkitexas is telling you. With new screw styles since the older wood screws were made some adjustments can sometimes be made, especially with soft woods vs hardwoods and threaded length, but the concept is the same. Following this information will save you the aggravation of screw failure and the time trying to extract it.
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