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All pictures and texts in this web page are the property of nomaallim.com. Any use of any part of those contents without the written consent of nomaallim.com shall be subject to legal procedures as per international and local laws in the concerned country. Using the name "nomaallim" or "nomaallim com" or "nomaallim.com" in the text describing the unauthorized copied content shall not constitute an exception and shall be sanctioned in accordance to the effective laws and proceedings.
BEFORE YOU START
You should wear safety goggles when drilling the broken bolt, do not carry out this job if you have no goggles. |
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DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
What to do if a bolt is broken and remains inside its hole?
This bolt holding the burner support to the boiler's body broke inside its threaded hole despite the use of penetrating oil before attempting to loosen it.
Using a bolt extractor isn't of interest in this case, since the bolt got stuck to its thread due to corrosion.
It is recommended to drill the bolt and have the new larger hole threaded again for getting the rid of the corrosion.
Using a bolt extractor isn't of interest in this case, since the bolt got stuck to its thread due to corrosion.
It is recommended to drill the bolt and have the new larger hole threaded again for getting the rid of the corrosion.
Fixing a broken bolt
Start by hitting the center of the bolt with a punch then drill it with a 4 or 4.5mm bit to start.
As a general rule, when drilling steel, you should always start with a small drill bit, then enlarge your hole progressively.
Enlarge the hole by using a bit which size = the bolt size - 1.5.
For example, use a 6.4 or 6.5mm bit for an M8 bolt.
As a general rule, when drilling steel, you should always start with a small drill bit, then enlarge your hole progressively.
Enlarge the hole by using a bit which size = the bolt size - 1.5.
For example, use a 6.4 or 6.5mm bit for an M8 bolt.
Now use the threading taps in the right order to re-thread the hole.
The taps are marked 1-2-3 but an experienced DIYer recognizes them visually.
Generously pour oil on the threading tap and alternate your movements by rotating clockwise and counterclockwise around a hard point until you cross it.
Do not hesitate to drill a larger hole and use the next size bolt (e.g. M10 instead of M8) if necessary.
The taps are marked 1-2-3 but an experienced DIYer recognizes them visually.
Generously pour oil on the threading tap and alternate your movements by rotating clockwise and counterclockwise around a hard point until you cross it.
Do not hesitate to drill a larger hole and use the next size bolt (e.g. M10 instead of M8) if necessary.
