At 04:03 PM 6/27/2010 Sunday, David Beierl wrote:
>At 03:00 PM 6/27/2010 Sunday, Mike \"Rocket J Squirrel\" wrote:
>>I was wondering how to interpret "B4,8x38" -- so, what is that -- 4.8mm
>>(3/16'') diameter and, uh, 38 TPI? The "B" ... ?
>
>38 mm long would be 1 and .992125984/2 inches long.
>
>Type B has a 60ddeg flank angle thread and can form a thread in soft
>materials. The end of the screw is blunt, offering more thread
>engagement in short length applications.

Ps -- There must be at least a hundred variations -- fast helix, slow
helix, acute-angle plastic-cutting threads,  tri-lobe thread-forming
threads,  flat head, pan head (no cheese head AFAIK, that's just
machine screws), oval head, round head, fillister head, different
types of drill points, all the different types of drive -- straight,
Phillips &c., zinc plated, tin plated, nickel plated, chrome plated,
cadmium plated, regular steel or stainless.  I've never seen a sheet
metal screw made out of any yellow metal, but I may just possibly
have seen one of anodized aluminum.

d