Broken bolt
Seasoned HDF Member
Joined: Dec 2009
Posts: 17,684
Likes: 6,061
From: Niagara, Ontario, Canada
If you have one, use a left handed drill bit to drill through the bolt. Center punch well before you drill so that the bit doesn't drift. There are plenty of "broken bolt" extraction videos online. Different thoughts and ideas. The LH drill bit works best IMHO.
Good luck!
Good luck!
Road Warrior
Joined: Dec 2015
Posts: 1,826
Likes: 1,046
From: Southwest Desert
Oops! Yeah, need a reverse drill, and put some oil on the drill bit to help cool and cut through the steel....I bought an entire set of LH drill bits at Menards, for 9 dollars. On my first attempt, I drilled out a grade 8 bolt that was broken off in my frame. The bit needs to be New or very sharp.
Last edited by SirHarley; Mar 30, 2020 at 09:25 AM. Reason: addendum correction
Road Warrior
Joined: Dec 2015
Posts: 1,826
Likes: 1,046
From: Southwest Desert
I had a similar experience. (see post # 104 in this thread)
https://www.hdforums.com/forum/gener...s-year-11.html
https://www.hdforums.com/forum/gener...s-year-11.html
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Road Master
Joined: Jan 2019
Posts: 1,104
Likes: 883
From: Texas
I had a similar experience. (see post # 104 in this thread)
https://www.hdforums.com/forum/gener...s-year-11.html
https://www.hdforums.com/forum/gener...s-year-11.html
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Road Master
Joined: Jan 2019
Posts: 1,104
Likes: 883
From: Texas
So far have drilled with 1/8, 3/16, and 1/4" reverse drills. No back-out. Used small chisel to break off 3/16" depth of remaining bolt shell around outer edge of hole to access existing threads. Got about 1/4" tapped, very slowly, breaking chip often with 5/16 tapered tap. Will follow up with bottoming tap. Slow process. Waiting for wet stuff to stop falling. Ken
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Road Master
Joined: Jan 2019
Posts: 1,104
Likes: 883
From: Texas
No parts to cover below...axle reinserted during drilling. Not many chips flying around when drilling Grade 8 steel in a hole.. Calipers, etc.removed. Most all small pieces ran directly out of hole and dripped on ground...used lots of thick drilling lube. Ken
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