What fasteners should never be reused?
Fasteners in high strength applications should never be reused even if they look to be in good shape. Fasteners not only get worn but accumulate internal microscopic damage as a result of cyclic fatigue. Therefore, fasteners used in transportation which could cause loss of life in their failure should never be reused. What problems do 12-point fasteners present? Answer: Most 12-point fasteners are used in aerospace where it is always important that the fastener not fail. Twelve-point fasteners are always designed to have smaller heads than normal which means they require a higher load on the wrench than a six-point fastener would impose on a wrench. At the same time, they are higher strength at least 180,000 psi and sometimes higher. This requires the best rate of wrenches in good condition. Wright Tool makes spline wrenches which have been designed to turn both 12-point or 12 spline fasteners. Does it make any difference what sequence you tighten lug bolts in Canada? Answer: Yes. If y
