Common carrier. A common carrier in common law countries (corresponding to a public carrier in civil law systems, usually called simply a carrier) is a person or company that transports goods or people for any person or company and that is responsible for any possible loss of the goods during transport.
Best Answer: Torque is a twisting force. It is the power output of an engine at one specific point in time. The first number, 200 in your expample, is the amount of torque. In America is is measured in foot/pounds. The second number, 400 in your example, is the RPM where that torque number occurs.
Manufacturers determine the amount of torque that is needed to stretch a bolt or stud the correct amount and they include that torque specification in their service documentation. It is important to note that most engine torque specs require 30w engine oil to get the correct stretch on the bolt. Some specialty fasteners require a specific lubricant. It is important to know which lube, if any, the bolt requires and to use it when tightening it. A torque wrench really only senses friction.