Strength of cast threads
Strength of cast threads
(OP)
Im trying to specify a torque value for a bolt that is screwed into a cast iron box. The recommended torque, using the recommended preload, is pretty straightforward from the Machinery's Handbook. But, this also assumes your using a similiar grade of nut (I think). I'm using a grade 8 bolt so I'm pretty sure the cast iron threads will break first. I don't want to torque the bolt to it's recommended value and then over stress the weaker cast threads. Is there a rule of thumb or equation that addresses this kind of situation?
Thanks
Thanks





RE: Strength of cast threads
Have a look at this site and just put the values of stress for each different material in the equations
http://ww
desertfox
RE: Strength of cast threads
You will need to know what grade of cast iron you have.
RE: Strength of cast threads
We would try not to use high strength bolting for CI. . The fasteners were mostly ASTM A108 material.
As posted above knowing your material and with judicious application of torque you could use a higher strength fastener.
RE: Strength of cast threads
thread725-35222: Tensile capacity/minimum engagement
Regards,
Cory
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