Line　defects　are　one-dimensional　phase　singularities　(forming　knots　and　links)　that　arise　in　a　variety　of　physical　systems.　In　these　systems,　isophase　surfaces　(Seifert　surfaces)　have　the　phase　defects　as　boundary,　and　these　Seifert　surfaces　define　a　framing　of　the　normal　bundle　of　each　link　component.　We　define　the　individual　helicity　for　each　component　of　a　link　singularity,　and　prove　that　each　individual　helicity　is　zero　if　and　only　if　there　exists　a　Seifert　framing　for　the　link.　We　extend　these　results　to　multi-armed　defects.　We　prove　that　under　anti-parallel　reconnection　of　defect　strands　total　twist　is　conserved.