According to this calculator, reducing the size of the bolt major diameter while retaining the same torque increases the clamp force. Interesting, but I reckon it makes sense as you are concentrating that energy in a smaller area? Or does the smaller diameter just have less friction consuming the applied torque, so you get a more efficient clamp?
However, I'll have to run a fairly large washer under the head of the 10mm bolt to keep the it from falling through the pivot bore in the chassis...so is major bolt diameter the diameter of the thread, or the actual diameter of the head of the fastener? Thoughaccording to the diagram it's just the outer diameter of the thread.
So in theory the 10mm bolt torqued to 60nm will actually clamp the bearings tighter than a 16mm nut torqued to the same spec?