Counterbore
A counterbore, might be called a countersink (which also used to describe the tool designed to make a counterbore), is where a second drill hole is made after a pre-drill hole or bore (for a screw length), this is normally only a partial drill hole and usually with angle edges. It is made to allow the head of the screw to sink into the wood or metal further so that the screw or bolt head lies flush with the surface of the wood or metal being fixed.
[edit] Related articles on Designing Buildings
- Carpentry.
- Facts about forestry.
- Janka hardness rating scale.
- Nails - a brief history.
- Sustainable timber.
- Staircase.
- The differences between hardwood and softwood.
- The use of timber in construction.
- Timber.
- Timber vs wood.
- Types of timber.
- Types of timber species.
- Whole life carbon assessment of timber.
- Wood around the world.
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
The Building Safety Regulator announces a call for evidence.
Government approach could undermine delivery and regeneration.
World's first mass timber data centre.
The overlooked environmental aspect of data centre development.
Introduction to radon awareness
New technical information sheet published by CIOB.
Updated supplier guide can help electrical contractors engage with NHP.
CIAT confirm the winners of the 2026 architectural technology awards.
Government launches a one stop shop for flood preparedness.
Sir Edwin Lutyens: Britain's greatest architect? Book review.
CIOB publishes free template to help assess and manage risks.
ECA's reflections on Party Conference season
Burnham wants to be confident of winning before asking for a fresh mandate.
New Chief Construction and Scientific Adviser
Sergio Cavalaro, Professor of Infrastructure Systems at Loughborough University.
Building safety levy for England
CIAT publish estimator tool for members.
Comments
[edit] To make a comment about this article, or to suggest changes, click 'Add a comment' above. Separate your comments from any existing comments by inserting a horizontal line.