Hanger bolts and dowel screws are used for adding an external machine or screw thread to wood applications.
Hanger bolts have machine threads for use with a nut or in a tapped hole on one end and wood threads on the other.
A corrosion resistant steel alloy. The most common stainless steel for general hardware use.
A low carbon steel for general use. Unplated finish.
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Dowel screws have wood thread on both ends for wood to wood fastening.