broke a bolt on my saddle clamp

[Queen of Skulls]

Riding along on my vb 218... my "saddle" was making noise and pop no saddle supporting my weight...  the hardware shouldnt do that. Ya I am a bigger rider at 100kg.  I didnt over torque them.... It might be a good idea to replace the bolts on seat posts for automotive grade 5 or the a2-70 stainless is good for tension straight. aka what they have in ACE hardware.