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J. Clarke[_4_]

In article ,
says...

The screw I need will go through one "leg" of a "C"-bracket and into a 3/4" thick particle board (without going through the board,

The 5mm x 40mm screws your recommend have nominal length of 1 1/2" for use with 1/2" thick materials.

Personally I'd through-bolt it--if the other side has to be flat I'd use
flat-head machine screws.

But if it absolutely has to be a blind hole, your best bet is probably
to use something like these:

http://www.mcmaster.com/#92105a016/=y08q4e

Note that they come in different lengths and diameters and in several
styles.