{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">A factor used in the bending stress and contact stress formulas to take account of sudden shock loads which are not known or have not been taken into account in establishing the operating tooth loads. The service factor listed on the motor nameplate refers to a measure of the reserve margin built into the motor. Motors rated over 1.0 SF have more than normal margin, and are used where unusual conditions are likely to occur, such as high or low voltage or momentary overload.<\/div>"}}