Defence & Military II (EN)
What is the difference between a prime contractor and a subcontractor?
The prime contractor holds the contract directly with the customer and is answerable for the complete delivery. A subcontractor has no contract with that customer at all; it supplies the prime and is bound by the requirements the prime passes down. The practical consequences show up in liability, flow-down clauses, payment terms and audit rights.
Related services
Two different contractual positions
The prime signs the contract with the end customer — a government agency, an armed force or a large system house. It carries responsibility for scope, schedule, price and conformity of the whole delivery, including everything produced by others.
A subcontractor signs a contract with the prime, not with the end customer. Supply chains are frequently several layers deep, with tier one suppliers delivering assemblies and lower tiers supplying components, raw material or special processes. Each layer is only in privity with the layer directly above it.
What changes in practice
| Aspect | Prime contractor | Subcontractor |
|---|---|---|
| Contract partner | The end customer | The prime or a higher tier |
| Responsibility | Whole system, including subcontracted work | Own scope of supply |
| Requirements | Negotiated with the customer | Flowed down by the prime |
| Payment | From the customer | From the prime, on its terms |
| Audits | By the customer | By the prime, sometimes by the customer |
Flow-down: the point suppliers underestimate
Primes are obliged to pass on many contractual requirements. Typical flow-down clauses cover quality standards such as AS9100 or the NATO AQAP documents, traceability and record retention, configuration and change control, counterfeit part prevention, confidentiality and security, export control obligations, and the customer’s right of access for inspection.
Read them before signing, not afterwards. Record retention periods, liability caps, warranty duration and delivery penalties are where a small supplier can accept far more risk than the order value justifies. It is entirely normal to negotiate these terms — many primes expect it.
The two roles are not mutually exclusive. A mid-sized manufacturer may act as prime on a small direct contract while being a tier two supplier on a larger programme. What changes is not the workshop but the contractual obligations attached to the job.
Key points
- The prime holds the customer contract and answers for the complete delivery.
- A subcontractor contracts with the prime, not with the end customer.
- Flow-down clauses pass quality, traceability, security and export duties down the chain.
- Record retention, liability and penalty terms deserve review before signing.
Related questions
Can a subcontractor talk to the end customer directly?
Only if the prime agrees. Contracts frequently restrict direct contact, because the prime carries responsibility for the delivery as a whole. Government quality assurance is an exception: representatives of the customer may have access rights at any tier of the chain.
Who is liable if a subcontracted part fails?
Towards the end customer the prime is liable, because it holds that contract. The prime can then pursue the subcontractor under their own agreement. This is precisely why liability caps and warranty terms in the subcontract deserve careful reading.
Is being a subcontractor a disadvantage?
Not necessarily. The role brings far lower bid and administration costs and no responsibility for system integration. The trade-offs are less direct access to the customer, dependence on the prime’s schedule and payment behaviour, and limited influence on requirements.
More questions
Discuss your part with us
Have a drawing or a 3D model and need a reliable assessment of feasibility, material and lead time? Send us your documents and we will come back to you with a concrete answer.