NX Assembly application gives you the ability to model assemblies of piece part files and subassembly files. An assembly is a part file that contains component objects, while a subassembly is an assembly used as a component in a higher level assembly.
Assembly constraints define the positions of components in the assembly. NX uses directionless positioning constraints, which means that either component can move to solve the constraint.
In this NX Quick Tips video, I'll show you a new assembly constraint, Align/Lock.
Align/Lock constraint is useful if you want to position and fully constrain rotationally-symmetric components. It's helpful if you have a component that you want to constrain using an axis, and you want to simultaneously prevent rotation about that axis. For example, you often use an Align/Lock constraint to position and lock a bolt in a hole.