How to Use Counterbores

A counter-bored hole has two diameters; a large diameter that is big enough to fit the screw head and the smaller diameter houses the shaft of the screw.



Benefits of having a counter-bored hole are:

•	A smooth, clean surface is sustained when a large fastener is needed

•	A counter-bored hole allows for a part to be fit into tight clearances without needing the extra headroom of a bolt

Safety
•	A short-sleeved shirt, long pants, closed toed shoes and eye protection are required while operating machinery.

•	An operator should not wear gloves or jewelry.