Case designs (was: New Definiton REQUIRED)

Uh huh... not true. Actual production of screws comes in gress what? Roll of wire! Snipped to short lengths by shear action then fed to 2 or 3 machines then in the end is screws. All, I can say so all screws produced except for very specialized needs are rolled formed using hardened thread plate that impresses the thread into blanks. The heads with slots or whichever are deformed first in one step then roll the thread. Problem arises when quality control comes in. If the lube and quality, speed, quality of blanks metals are poor, you get malformed screws and bad threads. Some screws are plated as well. Actually top quality rolled screws are much better than machined screws and much cheaper too, also stronger because metal grain is still intact. Troll