How to Repair Cross Threaded Bolts

Written by c.l. rease
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How to Repair Cross Threaded Bolts
Perfect threads allow a nut and bolt to thread together. (bolt image by Sergey Galushko from Fotolia.com)

Cross threading occurs when the threads of a bolt shift off centre and cut into the female threads of a threaded hole or nut. The cross threading damage caused by the bolt occurs in the top female threads of the threaded hole or nut. Cutting new threads on the cross-threaded bolt and the damaged female threads will repair the damage.

Skill level:
Easy

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Things you need

  • Socket
  • Ratchet handle
  • Thread gauge
  • Tap set
  • T-handle tap wrench
  • Cutting fluid
  • Vice
  • Die set
  • Die socket

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Instructions

  1. 1

    Match a socket to the head of the cross-threaded bolt. Attach the socket to a ratchet handle. Turn the bolt counterclockwise to remove it from the part.

  2. 2

    Thread the bolt into a thread gauge.

  3. 3

    Select a tap matching the diameter and the thread count of the bolt into a T-handle tap wrench. Pour cutting fluid onto the threads of the tap and damaged part threads.

  4. 4

    Turn the tap clockwise to thread it into the damaged part threads.

  5. 5

    Set the head of the bolt in a vice with the bolt threads facing up. Lock the head of the bolt into the vice jaws.

  6. 6

    Secure a die -- matching the bolt's size and thread count -- into a die socket. Turn the die socket clockwise to cut new threads on the bolt.

  7. 7

    Thread the bolt into the threaded part.

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