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Help on removing rounded off Hex head

Old 01-03-21, 11:20 PM
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rsbob 
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Help on removing rounded off Hex head

Was a dumb-@$$ and rounded off the seat post bolt. Suggestions on removing?

And yes, I will buy some proper Ritchey hex tools heads so this doesn’t happen again.

TIA
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Old 01-03-21, 11:30 PM
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Wilfred Laurier
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The last resort when removing damaged bolts is to drill out the head with a drill bit similar in size to the diameter of the threads.

If the seatpost clamp is integrated into the frame then it might be a pain to get the rest of the bolt out -maybe an Easy Out (google it)

If the clamp is removable (not a built in part of the frame) then you can probably just buy a new clamp. The threads and the face of the bore where the head of the bolt sits can get damaged over time and reduce the clamping force, which usually results in the bolt being overtightened.
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Old 01-03-21, 11:40 PM
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Originally Posted by rsbob View Post
Was a dumb-@$$ and rounded off the seat post bolt. Suggestions on removing?

And yes, I will buy some proper Ritchey hex tools heads so this doesn’t happen again.

TIA
Go to Lowes and get some Grabits.

This was a screw from the timing cover for an engibe I was working on. The head was a 4mm. This Grabit fit perfectly in the head, and allowed me to easily remove the screw.


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Old 01-03-21, 11:42 PM
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Originally Posted by rsbob View Post
Was a dumb-@$$ and rounded off the seat post bolt. Suggestions on removing?

And yes, I will buy some proper Ritchey hex tools heads so this doesn’t happen again.

TIA
Go to Lowes and get some Grabits.

This was a screw from the timing cover for an engine I was working on. The head was a 4mm. This Grabit fit perfectly in the head, and allowed me to easily remove the screw.


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Old 01-04-21, 12:34 PM
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Originally Posted by phughes View Post
Go to Lowes and get some Grabits.

This was a screw from the timing cover for an engine I was working on. The head was a 4mm. This Grabit fit perfectly in the head, and allowed me to easily remove the screw.


40 years of turning wrenches on everything from helicopters to high speed packaging machines.... ^^^^^ that right there is the best solution
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Old 01-04-21, 01:12 PM
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In the past I have dremel'd a slot into them then used a large flathead screwdriver. For the torque range of a seat post clamp, shouldn't need much torque.

Otherwise, yeah.......that tool shown above is awesome. Used them on my car plenty of times.
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Old 01-04-21, 01:12 PM
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Internal Allen head? - Find the closest Torx bit and pound it in there and unscrew it.
External hex head? - Vice grips or grinder/dremel and cut the head off.
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Old 01-04-21, 02:10 PM
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I've never had much luck with Grabit's. The Torx trick works sometimes. Drilling out the head has worked for me. I've also used a Dremel and flat cutting tool to cut the middle of the screw through the clamp opening.
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Old 01-04-21, 02:15 PM
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Phughes - thanks for posting about that Grabit. I've had a set of easy outs but honestly never had a success with them. I gotta keep that in mind the next time I visit the big box store.
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Old 01-04-21, 04:00 PM
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Beside a grabit or other removal tool, use a small punch and give the bolt a few good raps in the center. That helps to "unload" the threads and makes the removal tools work easier.
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Old 01-04-21, 04:21 PM
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Originally Posted by burnthesheep View Post
In the past I have dremel'd a slot into them then used a large flathead screwdriver. For the torque range of a seat post clamp, shouldn't need much torque.
I was going to suggest this method. I've used it plenty of times, on both stripped out screws and special screws like the torx heads with the little pin sticking up in the middle so you can't use a regular torx bit on them.
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Old 01-04-21, 04:30 PM
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Originally Posted by rsbob View Post

And yes, I will buy some proper Ritchey hex tools heads so this doesn’t happen again.

TIA
Harbor Freight is good enough if the tools are the right size.

Also important, no matter what brand of tools you use, is to know when to stop. There's an internal torque wrench/ bad feeling/ material strain gauge that you can develop over time. It works until it doesn't.
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Old 01-04-21, 04:41 PM
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Old 01-04-21, 04:52 PM
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Will a cut off disc in a Dremel reach the middle of the bolt between the ends/sides of the clamp? You might be able to just cut it in half.
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Old 01-04-21, 06:23 PM
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Originally Posted by dedhed View Post
Find the closest Torx bit and pound it in there and unscrew it.
+1
Used this method to save my Vintage Stem.
Use a little finesse and support the seat clamp from behind when you tap in the Torx.

Barry
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