.row.no-gutters {
  margin-right: 0;
  margin-left: 0;

  & > [class^="col-"],
  & > [class*=" col-"] {
    padding-right: 0;
    padding-left: 0;
  }
}

<div class="row no-gutters">
  <div class="col-xs-4">...</div>
  <div class="col-xs-4">...</div>
  <div class="col-xs-4">...</div>
</div>

.no-gutter.row,
.no-gutter.container,
.no-gutter.container-fluid{
  margin-left: 0;
  margin-right: 0;
}

.no-gutter>[class^="col-"]{
  padding-left: 0;
  padding-right: 0;
}