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What is the best bit for drilling out broken bolts?

March 14 2008 at 4:24 PM

Rich  (Login RLT59)

I was removing the rear axles in my old Honda CRV when I broke a bolt.

Bolt #31 (the lower one) is pretty long. It's pointed on the end.

I had already worked on the left side and found that bolt was really hard to get out.
It was covered in rust dust.. When I got to the right side, it felt like it was coming out,
but then snapped in half.

The bolt had an OD of about 0.39" and 3.15" long.
(90173-SR3-003 BOLT, ARM TORQUE (LOWER) (10X80)

So, the metal must be pretty hard, what is the best kind of bit to use?
Everything I have on hand is regular high speed steel.

What is left of this bolt is SO tight, I don't see anyway that an Easy-Out would work.

Any drilling tips would be appreciated.


This message has been edited by RLT59 on Mar 14, 2008 4:34 PM

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