How To Repair Damaged Bolt Threads
Overview
A stripped or threaded nut or bolt tin exist a cause of unbelievable frustration. Time can hands be lost when it ways an unwanted trip to the fastener specialist, or worse still, if the thread in question isn't that easily replaceable.
Thankfully, tool manufacturers accept considered this, and come up with a range of options to get your task back on track. And so what tools are available to repair a damaged thread?
Tap and Die Prepare
This one y'all may have heard of earlier. These tin exist purchased as metric or purple sets if you only use one or the other; or as a massive combination prepare with taps and dies to cover all bases. Inside the kit you'll find taps for repairing and creating within threads, and dies for repairing and creating exterior threads. Each of these is marked with the thread size and pitch it is designed to work with.
You'll also find a dice handle and tap wrench which each of these pieces tin can slot into, and the combination set contains thread pitch gauges to help yous determine which tap or die you need.
Steps
How to Utilise a Tap & Die Fix
Step ane:
To repair an outside thread like a bolt or stud, first ensure it is fixed tightly in place or in a demote vice.
Step ii:
Use a thread pitch gauge to determine which die y'all need, or very carefully match the die to the thread by trialling dissimilar ones; then fit the die into a die handle.
Footstep 3:
Lubricate the thread with a thick lubricant such as motor oil, then begin winding the die downward upon the thread. Pay very close attention to getting the die on direct for the first few turns at least.
Commence the thread cutting using house and even pressure - with a quarter turn clockwise, followed past a quarter turn anti-clockwise to clear the metal shavings from the thread.
Pace 4:
Repairing an internal thread using a tap occurs in much the same manner. The bolt which originally came out tin can be used to determine the thread size.
Step 5:
With a little lubricant applied to the tap and thread the tap must be advisedly wound in using the same quarter plough in, quarter turn out method as used with the dice.
Keen! But what if the thread is too big to exist repaired with a die?
Thread Repair File
Some threads are besides big or awkward to repair with a tap and die set, but all promise is not lost when there's a thread repair file in your kit! Over again yous can purchase ane for metric and one for majestic thread patterns. Fastener size does not affair when using a thread file, due to the nature of how you utilise it, which goes like this:
How to Choice a Thread Repair File
Step ane:
Determine the correct thread pitch to utilise by testing different sides of the file confronting an undamaged section of thread. You'll know you've got the correct one when the file sits perfectly betwixt the ridges of the thread, and no light comes between the file and the threads.
Stride 2:
At present, brainstorm filing with medium pressure on a section of thread just next to the damage and piece of work your style across.
Step 3:
Run a nut over the thread periodically and continue filing until the nut runs smoothly over the damaged section.
Stripped thread? No worries!
With these tools in your collection, you'll barely bat an eyelid at stripped or damaged threads. You lot tin even apply a tap piece to create a make new threaded pigsty, or a dice to arts and crafts a commodities for very specific applications.
Source: https://www.supercheapauto.com.au/blog/how-to/tools-workshop/fixing-a-stripped-bolt-or-nut-thread.html
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