Our Hanger Bolts/Combination Screw are for special applications. Hanger bolts with machine threading on one end, wood threading on other end, are for use to fasten a metal part to a wood surface.
A combination screw is for use with the installation of standoff systems, providing a better fit and the ability to hold more weight than standard screws.
F14X35HBU 1/4 - 20 x 3 1/2"
F516X25HBU 5/16 - 18 x 2 1/2"
F516X4HBU 5/16- 18 x 4"
F832SMHSU 8 - 32 x 3/4"