Tightening spring clips. How tight?

BashawT

Senior Member
Just snapped one of my spring clip bolts reassembling spring. I noticed the nut and bolt were not hardened bolts so my question is how tight should they be and should I buynew hardened bolts. Also should I use a lock washer?

Thanks guys!
 
snug enough so they don't rattle, 1/4-20x2 3/8 with square nut. Judging stds show no washers.
 
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