It needs to use nstdblength, because it takes half the length from the boltref of each flange and they are not neccessarily identical.
So if the length of flange 1 sbol is 3" and the length for flange 2 sbol is 3.1/2" then the bolt length for the joint should be 3.1/4".
Just taking length of Sbol 3" would be too short and 3.1/2" too long
It needs to use nstdblength, because it takes half the length from the boltref of each flange and they are not neccessarily identical.
So if the length of flange 1 sbol is 3" and the length for flange 2 sbol is 3.1/2" then the bolt length for the joint should be 3.1/4".
Just taking length of Sbol 3" would be too short and 3.1/2" too long
