Torque application is applying a rotational force on a threaded fastener. Physics demands that the torque be applied at 90-degrees to the fastener. Any deviation from the 90-degree plane and called side-loading. Side-loading causes a change in the torque output.
Now you are adding variables to your torque application process. The problem is that you are using a torque wrench to eliminate variables, but instead, by side-loading, you are adding variables. Adding variables only diminishes the quality of the product you are assembling.
That is why side-loading is important. Each time you side-load a fastener you run the risk of non-compliant fasteners. They can be too tight, or too loose. Either way, you have assembly standards that are not being met.
Have questions? Need help choosing the right torque tool for the job?
Sturtevant Richmont torque wrenches and torque testers are made in Carol Stream, Illinois by highly capable union hands.