Turn of Nut (Part Turn)
After snugging the joint, the bolt shank and nut is marked and then a specific amount of rotation is induced between the nut and the bolt. The amount of rotation differs for different bolt lengths and diameters and therefore must be known and understood by the bolt installers in advance. The success of the method is dependent on a correct snugging of the joint, and is dependent on the bolt head being held from turning so the bolt does not spin in the hole.
Two persons are therefore MANDATORY to execute this method correctly – one to hold the bolt from turning or "rolling" and the other person to operate the wrench.
Note: Turn-of-nut does not work correctly when the steel surfaces are coated with a compressible coating such as high paint thickness or hot dipped galvanized zinc.
