How to use hanger bolts

Written by c.l. rease
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Hanger bolts have one coarse and one machine-threaded end. The coarse threads hold the hanger bolt in a piece of wood. The machine threads allow you to bolt a part to the wood with a machine nut. To ensure a strong connection between the wood and the part, you need to install the bolt properly.

Skill level:
Moderately Easy

Things you need

  • Pencil
  • Drill bit
  • Variable speed drill
  • Tape measure
  • Two machine nuts
  • Two adjustable wrenches

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  1. 1

    Mark the location for the hanger bolt on the surface of the wood with a pencil.

  2. 2

    Install a drill bit sized for the hanger bolt into the chuck of a variable speed drill.

  3. 3

    Measure the length of the coarse threads with a tape measure. Wrap electrical tape around the drill bit at the length of the hanger bolt coarse threads. Move the electrical tape further up the drill bit if installing a hanger bolt through a material covering the wood. For example, add 1/2 inch to the hole depth if installing a hanger bolt into a wall stud covered with drywall.

  4. 4

    Drill a hole at the marked location. Stop drilling when the electrical tape wrapped around the drill bit meets the surface.

  5. 5

    Thread both nuts onto the machine threads of the hanger bolt. Lock the nuts together with two adjustable wrenches. Insert the pointed end of the hanger bolt into the drilled hole. Turn the nut closest to the end of the bolt clockwise with an adjustable wrench. Continue turning the bolt until all coarse threads are inside the drilled hole.

  6. 6

    Place one adjustable wrench on the nut closest to the surface. Turn the other nut counterclockwise with the second adjustable wrench to loosen the double nuts. Remove both nuts from the hanger bolt.

Tips and warnings

  • Use hanger bolts with a non-threaded centre shoulder when installing the bolts into wood covered with thicker materials.

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