Long-lead item

A long-lead item is a material or component that takes so long to approve, make and deliver that it must be ordered early to avoid delaying the project.

What long-lead item means

A long-lead item is anything whose order-to-delivery time is long enough that, unless ordered early, it will hold up construction. Typical candidates are custom fabricated products, specialised equipment and imported components, though what counts depends on the project and market.

Teams identify them during planning and often order before the rest of the design is complete.

A plain example

A custom-fabricated component needs shop drawings and approval before production starts. If the schedule needs it on site in month five and total lead time is four months, the order must be released by month one. The month counts are illustrative only.

Why it matters

Long-lead items often sit on the critical path. Early release means committing money before everything else is fixed, so the risk is design change after ordering. A design freeze on those items helps manage that risk.

Common confusion

Long-lead is a judgment about schedule risk, not a fixed number of weeks. A product with long lead time that is needed late may not be a problem. Conversely a short item can become critical if approvals slip.

Practical checklist

A long-lead log is a short document that earns its keep. Typical content follows.

• Item description, specification reference and the supplier being used.
• Date required on site and the latest date to approve and order.
• Current status: submitted, approved, ordered, in production or shipped.
• Risks, such as design changes pending or limited supplier capacity.
• The owner of the item and the date of the last status check.

Related terms

• Lead time
• Critical path
• Design freeze
• Purchase order

Questions people ask

How do I find long-lead items?

Compare supplier lead times, including approvals, against when each item is needed on site.

Should long-lead items be ordered before design is final?

Sometimes, if the item is frozen and the risk of change is accepted by the owner.

Who tracks them?

Usually the project manager or procurement lead, using a log reviewed each meeting.

Sources and further reading

• ISO
• U.S. General Services Administration

Text Digital Oro

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