Cross threading occurs when the threads of a bolt shift off center 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.
Test fit the bolt in its hole. It should travel in and out of the hole freely. Never cross-thread the wrong type of bolt into a hole. A bolt with an incorrect thread pattern will only twist a few times before binding. Once the bolt binds, the mating surfaces start to deform. Continuing to apply torque will strip the bolt-hole's threads.
I used option #2 to fix a stripped hole in a bicycle shock absorber. I bought the Helicoil kit sized for my bolt from a automotive supply store. The kit came with the drill bit and tap sized for the outside threads of the coil. I drilled the hole, tapped the threads, then threaded the coil into the hole.
Chasing Threads Tap and Die How to fix a stripped bolt Taps and dies are tools used to create screw threads, which is called threading. ... How to Fix a Stripped Bolt Hole Threaded Inserts ...
To repair a cross-threaded bolt, ensure the bolt's shank is free of damage, then use a die tool to repair the bolt. If the shank is damaged, it is best to replace the bolt, rather than attempt to repair it. A die tool is a specialized tool that features the matching diameter and pitch of the threads on the bolt that needs to be repaired.
The threads of a bolt or nut are designed to engage with the axis of each aligned, which allows the peaks and valleys of the threads to slide across each other. If the bolt is applied at an angle, the threads can engage the nut or threaded hole in such a manner as to cut through the existing thread, creating a poorly sliced section.
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.
What are the advantages and disadvantages of using the Oversize Thread Repair Method? Advantages: Depending on the circumstances, this can be the fastest and easiest thread repair method to accomplish. Disadvantages: The perception of using a mix of thread sizes in a bolt hole pattern is usually undesirable.
When installed into the larger repair threads, the wire forms a set of threads engineered to meet the original dimension of the stripped-out hole. The repair threads for the HeliCoil insert are made by using a Screw Thread Insert or S.T.I. tap. This is the same type of tap used for some other inserts.