Installing a lockset today (el cheapo Kwikset entry w/deadbolt), I
noticed they included two of those weird screws in the hardware package.
I worked out that they were intended to hold the passage lock strike to
the jamb.

They're regular flat-head wood screws, except that the threads just
under the head change from coarse to fine, almost like a machine screw.

Does anyone know the purpose, or the rationale of using these screws?
I've often seem them in lock installations, but nowhere else. Are those
fine threads supposed to grip the wood better?

D "puzzled" N


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