For a black wood screw, check this site: http://www.mcfeelys.com/

They have a "find a fastener" tool on their web site:
http://www.mcfeelys.com/find-a-fastener.asp

The smallest black screw they have is a #6x1 fine or coarse thread, in
square recess or Phillips head.  Maybe one of these would meet your needs.

Bill Mackin, Iowa