Say I have a bunch of screws. Say they are all flat (countersunk) head, phillips drive. They can be different shank/root diameter, with or without a smooth shank, different thread coarseness, color, etc.

They all have a pointy end, about the same angle of point with maybe a small difference in how far from the point the threading ends. They are all magnetic.

Exhibit A: enter image description here

I know screw #1 is a decking screw and I know that screw #7 is drywall, because that's what the packages said. #6 is brass-color and #8 is gray (and rust), the others being the color they look to be.

Wood screws will generally have a smooth shank at the top, being wood screws, but some (like #9 I think) don't. And a lot of drywall screws are black.

I have a lot of loose screws. How can I determine the types of screws?


1 Answer 1


Drywall screws have a “bugle head”.

Flat head wood screws have a “tapered head”.

This may help: https://www.boltdepot.com/fastener-information/type-chart.aspx


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.