Home Glossary Long lead item Glossary Long lead item By Deviation Check Editorial Team. Short answer A material or piece of equipment with a long manufacturing or delivery time, such as switchgear, elevators, or custom glazing. Its submittal has to be reviewed and released early so the order does not hold up the schedule. Related terms Submittal scheduleSubmittal Browse the full glossary, the CSI division guides, or learn how submittal review works. Then run a review. View this page as Markdown for LLMs and note-taking.