Does pre-drilling affect withdrawal resistance?

The majority of the time, self-tapping screws are installed with no pre-drilling. However, for some applications it is helpful to pre-drill a hole.
At least three European studies (cited in RInghofer, 2017) comparing the withdrawal resistance of self-tapping screws in pre-drilled and non-pre-drilled holes using self-tapping screws have shown that any difference can be considered negligible. This was confirmed in a recent North American Study as well (for further discussion, see our White Paper Screw Withdrawal Resistance in Near-Edge Applications).

Ringhofer, A. (2017). Axially loaded self-tapping screws in solid lumber and laminated timber products. Verlag der Technischen Universität Graz.
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Gallery edge distance draft july 17th website  1 Screw Withdrawal Resistance in Near-Edge Applications

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