Can I assign bolt pretension to soild bolt with MAT/LAW13 ( Rigid)

Hello,

I have assigned pre-tension load to bunch of solid both with linear steel properties. I have assigned very high Y stress so bolt wont get in to plastic state. But do see unrealistic stretching of bolt sometime. But we know these bolt wont give up based on our physical test data. 

So, as a quick fix, can I assign rigid material to these bolt? does pretension still work if bolts are rigid ?

Regards,

Naresh Kini