Lead Time — definition
Elapsed time between order confirmation and delivery or readiness of equipment for shipment, encompassing engineering, manufacturing, testing and logistics.
Lead time for standard catalogue equipment is typically shorter than for custom or special-purpose machinery, which requires engineering design, procurement of long-lead components, fabrication and factory testing before shipment. Lead times are a key input to project scheduling and cash flow planning.
Why it matters to industrial buyers
Underestimating lead time is a common cause of project schedule slippage, particularly for engineered equipment with long-lead components.
Key reference points
Typical ranges
Standard equipment often ships within 4–12 weeks, while custom or special-purpose machinery commonly requires 4–9 months.
Long-lead items
Components such as large motors, gearboxes or specialised steel can extend lead time beyond the base fabrication schedule.
Commonly confused with
Milestone schedule
Lead time is the total duration to delivery; a milestone schedule breaks that duration into tracked intermediate stages.
How it is used in practice
A supplier quotes a 20-week lead time for a custom filling machine, covering engineering, fabrication, factory acceptance testing and shipment.
Frequently asked questions
Can lead time be shortened after order placement?
Expediting is sometimes possible for a premium but is generally limited by component availability and factory capacity.
Does lead time include installation?
Typically not; lead time usually ends at shipment or delivery, with installation and commissioning tracked separately.
Go deeper on the platform
Related terms
Milestone Schedule
Summary schedule identifying key project dates and deliverables, such as design approval, factory acceptance, delivery and commissioning, used for high-level tracking.
Critical Path Method (CPM)
Scheduling technique that identifies the longest sequence of dependent activities determining the minimum possible duration of a project.
Factory Acceptance Test (FAT)
Formal verification test conducted at the supplier's manufacturing facility to confirm equipment meets agreed specifications before shipment to site.
Incoterms
Standardised set of trade terms published by the International Chamber of Commerce defining which party bears cost, risk and responsibility at each stage of shipment.
Spare Parts Package
Predefined set of components supplied alongside equipment to support commissioning, early operation and ongoing maintenance without extended supplier lead times.
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Reference content only. Global B2B Group is independent of equipment manufacturers and financing institutions; definitions are provided for education and do not constitute engineering, financial or legal advice.