as long as the bolt is snug it will do its job
the bolt isnt clamping , the belts retainers slide free on the shank of the bolt and the load is side load (shear ) and can see pull load on the bolt it self neither of which rely on a torque spec .
as long as the threads engage until the bolt bottoms it only needs to be tight enough to stay in place ,
if you want a number ..20-30 ft lbs is more than enough