Grade Eight Bolts

Posted by gmharris [71.105.178.157] on Sunday, May 01, 2011 at 23:01:15 :

Someone recently opined that grade eight bolts were too brittle to be used on suspension brackets.

I took a grade eight bolt and bent it over more than 90 degrees. No obvious signs of failure. When I tried to straighen it out, it failed at about 45 degrees.

I took a grade 3 bolt and bent it back and forth between zero and 90 degress several times. No failures. Obviouslly, the grade 3 bolts are more flexible than the grade 8 bolts, but given that the grade 8 bolt was able to withstand a more than 90 degree bend, I don't think they are too brittle for suspension work. Otherwise, what would be the point of grade 8 bolts?

I made the bends on the unthreaded portion of the bolts. When I made the bends in the threaded portion of the bolts, even the grade 3 and 5 bolts failed on the first 90 degree bend.

Follow Ups:

• Re: Grade Eight Bolts - dave royal 18:54:06 05/02/2011
• take a look at what the factory uses - Bruce in BC 10:42:36 05/02/2011
  • Re: take a look at what the factory uses - gmharris 21:29:00 05/02/2011
    • Re: take a look at what the factory uses - M Fanoni 12:21:49 05/03/2011
  • Re: take a look at what the factory uses - Kaegi 15:25:27 05/02/2011
    • Re: take a look at what the factory uses - M Fanoni 16:17:40 05/02/2011
      • Re: take a look at what the factory uses - Kaegi 22:15:00 05/02/2011
        • Re: take a look at what the factory uses - M Fanoni 11:55:50 05/03/2011
• Re: Grade Eight Bolts - D Sherman 03:08:16 05/02/2011
• Re: Grade Eight Bolts - Jason 00:51:43 05/02/2011
  • Re: Grade Eight Bolts - gmharris 01:25:33 05/02/2011

Post a Followup