The torque on a 1410 u-joint strap is determined by the amount of force required to turn an object. To calculate the torque, you must know the diameter of the u-joint strap and its rotational speed. Generally speaking, for a given size joint and rotational speed, higher force will result in higher torque. For example, if you have a 1410 universal joint (UJ) strap with a 3/4” diameter that turns at 1000 RPMs then it would require 18 ft-lbs of torque to keep it turning smoothly. On the other hand, if you increase the RPMs to 2000 then it requires 35 ft-lbs of torque to keep it spinning properly. It's important to note that these figures are only estimates and could vary depending on several factors such as temperature or lubrication levels so always double check your numbers before applying them in real world applications.