King pins

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Has anyone ever seen them snap/break? what are they made out of and how do you go about making them? just interested, I don't want to actully make them.
Reply:Yes, I've seen a couple doing collision repair on class 8 over-the-road rigs.  It takes a hellacious point blank hit in the spindle to cause one to snap.  Of course, the axle, spindle, brakes and tire\wheel end up on the junk pile.  I certainly don't know the metallurgy but it's pretty tough steel.I've been using one as a backup bar for installing buck rivets for a decade; hardly any marks on it in all that time.WeldingWeb forum--now more sophomoric banter than anything else!
Reply:King pins are made from heat treated 4130..They are then hardend and ground to size..You'll never cut one with a hacksaw.. Abrasive wheel will cut them.. ...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Originally Posted by zapsterKing pins are made from heat treated 4130..They are then hardend and ground to size..You'll never cut one with a hacksaw.. Abrasive wheel will cut them.. ...zap!
Reply:"A grinder knows no hardness"  My welding teacher told me that in 1979.  I believe him.  The probably harden them after they are made to size like things made out of drill rod.I was in an accident in a 1964 VW bug.  Broke the right kingpin into 3 pieces.  Basicly the piece in the spindle stayed there.  I had a lapbelt on before it was a law.  I put my face through the windshield and had no other injuries.David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by mat4130 cromoly ay?, what has me beat is why would they harden then and then try and ground them to size?. would be a bitch of a job.