Ever tightened a bolt a little too much and felt it suddenly break loose beneath the socket? It happens to most of us, and sometimes you can rescue the day by gripped the remaining thread with pair of locking pliers. But what if the worest has happened and the bolt has sheared off completely? This is where a screw extractor comes in very handy.
Start by finding the largest screw extractor in relation to the sheared off bolt to minimize the chances of the extractor itself breaking. Drill a hole in the top of the offending bolt to the size recommend in the instructions, insert the tapered, left hand thread of the screw extractor into the hole and turn the extractor anti clockwise.
Once the extractor has bitten into the metal of the bolt’s remains, use grips, tap wrench (from a tap and die set) or spanner to turn the extractor and remove the broken bolt. For especially stubborn sheared studs or bolts, a drop of diesel or penetrating oil left to sock in overnight can work wonders.
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