Why do torque wrenches need to be calibrated?

Why do torque wrenches need to be calibrated? Is it necessary to have a third-party calibration agency do the testing and what are the benefits of using a torque wrench to do calibration? This is a problem often encountered by torque wrench manufacturers (units). For the “why” prob.......

Komatsu PC130-8M0 hydraulic excavator

Since the first show in the Chinese market in 2005, the Komatsu PC130 excavator has been in the middle of the 10-15T class due to its moderate size. It not only enriches the product line of Komatsu excavator in this range, but also satisfies the construction and construction field in Ch.......