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Corroded Threads and How to Avoid Them

Corroded Threads and How to Avoid Them

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There are plenty of situations where it’s good to keep a handy tool for your corroded threads. For example, automotive castings are usually exposed to harsh environmental conditions and need to be checked once in a while. If you’re in bad luck, the casting might seize the bolt and you have to remove the bolt with an extractor. 

If you are working in a ranch or farm, chances are the best way to maintain your equipment is to keep your tools within reach. Your equipment must be maintained well especially before the rainy season comes in. This preparation applies to the nuts and bolts of your equipment, automotive, and also tractors.

On the other hand, if you were working on an equipment and accidentally mangled a thread while performing other mechanical work, it would help to keep a versatile tool that can fix any thread, inner or outer. 

Environmental Conditions Leading to Corrosion

Corroded Threads and How to Avoid Them
Corroded Bolts

Dissimilar metals behave poorly when exposed to rain and acid. The resulting effect between aluminum castings and steel bolts is what we call galvanic corrosion, or the corrosion between different metals. This kind of corrosion can happen to different metals that are in contact with one another in the presence of an electrolyte–which often comes from water, acid or salty air. 

Galvanic corrosion can accelerate other kinds of corrosion, so it’s worth your time to check your nuts and internal threads to see if there is galvanic corrosion between the bolt and the internal threads. These only occur between different metals–so bolts and castings that are both made of steel or aluminum cannot have galvanic corrosion.

Another reason for broken threads is the overall stress and fatigue from the load. Engine parts, being exposed to heat and the elements, plus the constant tension and wear and tear require regular maintenance, too. 

If your bolts and internal threads have been secured without preventive maintenance for years, chances are that the elements have already done their work to corrode the metals. So, it would be the right time to check on them.

Options to Repair Threads

If the bolt can be easily removed, just check if the threads are either corroded, dented, dinged, or hardened. You can either choose among the following options:

  • Replace the internal threads with an insert
  • Use a thread chaser
  • Use Rotary Thread
RTK1.1 Thread Starter Kit
  1. Using a thread insert. Thread inserts work well with inner threads which need to be repaired. However, thread inserts, as the name implies, cannot fix bolt threads that are dinged, corroded, or mangled. You have an option to use either a Helicoil or a solid insert for this task.
  1. Using a thread chaser. A thread chaser is a simple tool and a type of tap which can resolve basic issues in your thread. Compared to a cutter tap, which can strip away metal, a thread chaser will not strip away too much metal from the inner thread. It will simply reform the grooves by following the existing threads. Just insert the thread chaser and rotate until fitted into the hole. This will remove grease and other buildup which needs removing. However, if you have galling threads you will need a more precise and effective tool. 
  1. Rotary thread. Using a rotary thread follows three steps. Using light tool pressure, start in the good thread and then move into the damaged thread. Repeat as needed. As you would use a drill to punch a hole, or a dremel to cut into metal, using Rotary thread applies the same principle. Applying the precision of the Dremel tool with the right and light pressure, the Rotary thread can fix dented, hardened, or corroded threads. Rotary thread can also fix any inch, metric and pipe. It can work on coarse and fine threads, too. 

Amongst the three options, the advantage for performing immediate fixes goes to Rotary thread. It’s a versatile tool which works well with your drill or Dremel. During preventive maintenance work, if you check the bolts and inner threads of different sizes, you would need a Rotary thread which can cover all kinds of threads. Whether inner or outer threads, Rotary thread can cover them and repair them.

Nonetheless, thread chasers and thread inserts are useful, too; and are perfectly reliable as well for easy to restore threads. 

Keeping a Handy Tool for Repairing Threads

If your threads have corroded due to the elements and wear and tear, keeping a tool that helps out with preventive maintenance can save you time and money. Furthermore, there may be certain mishaps that would happen and you would need an immediate fix. 

The Rotary Thread is available in starter, standard, and master kits. Compact and lightweight, these tools are made of durable materials and weigh less than 2 lbs. Keeping these handy tools means you have a versatile tool that can be used for any corroded thread you need to fix.

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