A Study on the Reuse of Xylan 1424 Studs

While there are many factors that should be considered when determining if a stud can be reused, one of them is the nut factor. The study described in this paper set out to determine if the nut factor of a Xylan 1424 coated stud is significantly affected by the age of the coating and/or the cycles of tightening. A load cell was used to compare the nut factor: 1) of previously installed (used) studs to new studs, 2) of a new and used stud that were tightened more than once, and 3) associated with the first tightening pass to subsequent passes for a new stud. The results show that the age of the stud and the amount it has been tightened contribute to an increased nut factor for used Xylan 1424 studs.