Welcome to DU!
The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards.
Join the community:
Create a free account
Support DU (and get rid of ads!):
Become a Star Member
Latest Breaking News
Editorials & Other Articles
General Discussion
The DU Lounge
All Forums
Issue Forums
Culture Forums
Alliance Forums
Region Forums
Support Forums
Help & Search
Esoteric trivia.
Why is it called a countersink?
They are called “countersunk screws” because they “sink” into objects and surfaces. They feature a flat head that tapers along the shaft. Therefore, when you drive a countersunk screw into an object or surface, the head will sink so that it's flush with the respective material.
Common angles are 82 degrees for inch-sized fasteners and 90 degrees for metric fasteners. 100 degrees is also a common option with metric hardware.
They are called “countersunk screws” because they “sink” into objects and surfaces. They feature a flat head that tapers along the shaft. Therefore, when you drive a countersunk screw into an object or surface, the head will sink so that it's flush with the respective material.
Common angles are 82 degrees for inch-sized fasteners and 90 degrees for metric fasteners. 100 degrees is also a common option with metric hardware.
2 replies
= new reply since forum marked as read
= new reply since forum marked as read
