A consigned parts buyer review should define ownership, identity, source, condition, quantity, attrition, receiving checks, exceptions, surplus, and final disposition before shipment. The FAR 52.245-1 government-property clause is a U.S. government-contract example, not a universal commercial consignment rule.
OEMs should review consigned parts before anything is collected by a carrier. The review has one practical purpose: make sure the material that arrives can be identified, accepted, stored, issued and reconciled against the released PCBA build. Customer ownership does not answer those questions. A useful review connects the BOM line, full manufacturer part number, quantity, lot information where required, package condition and disposition rule to named owners on both sides.
The phrase review consigned parts therefore means more than checking a packing list. The OEM and EMS provider need the same definition of what is being supplied, which build it supports, what evidence travels with it and what happens when the shipment differs from the approved handoff. If any of those points remains open, the material may be owned by the customer and still be unsuitable for production release.
Define the Consigned Parts Buyer Review Decision
Consigned material is customer-owned material supplied for use in a defined manufacturing project. That definition must be tied to a specific BOM revision, assembly revision and build quantity. A generic statement such as “customer supplies ICs” does not identify the exact manufacturer, orderable part number, package, programmed state, approved source, quantity or effectivity.
Start by marking every consigned BOM line in the project material list. Record whether the customer supplies the entire requirement or only a constrained portion. Identify any material that is supplied as a programmed device, matched set, serialized item, moisture-sensitive package, custom mechanical part or controlled lot. Those attributes change how the item must be packed, received and issued.
The review should also state what is not consigned. If the EMS provider buys passives while the OEM supplies processors and connectors, that boundary belongs in the RFQ and build record. Declaring full, partial or special-item consignment during the PCBA RFQ checklist prevents two material plans from silently covering the same line or leaving it uncovered.
Which Consignment Model Is Being Used?
Different projects use different consignment models. In a full-consignment model, the OEM supplies nearly all production material and the EMS provider supplies process consumables or an agreed short list. In a partial-consignment model, selected BOM lines are customer supplied and the remaining lines are procured by the EMS provider. A third model covers one-time exceptions, such as a prototype lot, a customer-programmed device or material transferred from another manufacturing location.
The model affects quotation, inventory control and shortage ownership, so name it in the handoff. For each consigned line, record the required build quantity, expected good quantity, any agreed process allowance and the person who may approve a quantity change. Do not copy a percentage from another project. Package type, feeder setup, manual handling, inspection sampling and expected rework all influence the actual requirement.
When material comes from more than one customer location, each shipping source needs its own manifest and contact. Combining multiple unreferenced deliveries into one project stock balance makes later lot reconciliation difficult. The receiving team should be able to connect every package unit to a shipment, a material line and an accepted disposition.
Separate Ownership from Production Acceptance in the Consigned Parts Buyer Review
Ownership answers who holds title to the material. Acceptance answers whether the received item matches the agreed requirements for this build. The two decisions are separate. A sealed customer-owned reel may still carry the wrong manufacturer part number. A correct part may arrive without the required lot identity, with damaged packaging, with an unverified programmed revision or in a quantity that cannot support the released order.
The review should define the receiving checks that can be performed and the limits of those checks. A label check confirms label information within the agreed scope; it does not prove every characteristic of the contents. A quantity count does not approve a substitution. A visual packaging check does not reconstruct an unknown exposure history. If the project needs additional verification, it must be specified before shipment with a decision owner and an acceptance rule.
This separation protects both parties. The OEM retains control of the design and approved material definition. The EMS provider has a documented basis for accepting, holding or reporting a shipment. Neither side has to infer approval from the fact that a box reached the factory.
Specify What the OEM Releases Before Shipment
The shipment should not move until the project record identifies the released BOM and AVL, assembly revision, build quantity, target handoff date and consigned lines. Each line should carry the full manufacturer name and manufacturer part number rather than a shortened internal nickname. If a customer code is used, map it to the orderable part number.
The release package should state any required package, lot, date-code, storage, moisture, programming, serialization or certificate condition. These are project fields, not universal requirements. Leave a field marked “not required” when the project has made that decision; do not leave it blank where the receiving team cannot tell whether evidence is missing.
Align the BOM and project files before material leaves the buyer. The same file set used in the BOM and PCBA file intake should control the consigned-material handoff. If an ECN changes the accepted part or quantity after the manifest is issued, revise both records and identify the effective shipment or lot.
Assign Source, Condition, Freight, Shortage, and Disposition Roles
The consigned parts buyer review should name who bears source, condition, freight, shortage, loss, rejection, and disposition decisions for each line.
A responsibility matrix converts general cooperation into named actions. The table below is a starting structure, not a contract. Replace the role labels with the people and written terms for the project. Ownership of material, custody, risk of loss and authority to use or dispose of stock may transfer at different points.
Decision or task
OEM owner
EMS owner
Evidence required
Approval authority
Escalation point
Approve manufacturer and full MPN
Design or component owner
Confirm record received
Released BOM/AVL and revision
Named OEM authority
Identity conflict or missing approval
Provide source and shipment identity
Buyer or material owner
Receiving verifies agreed fields
PO/source reference and manifest
Project material owner
Unapproved source or unreadable identity
Preserve packaging and condition history
Shipping owner before pickup
Receiving and storage after accepted custody
Package condition and required history
Quality owners within written scope
Damage, unknown exposure or broken seal
Resolve shortage or excess
Approve replenishment or quantity change
Report counted balance and expected impact
Count record and build-demand comparison
Commercial and project owners
Insufficient material for released build
Dispose, return or retain surplus
Issue written disposition
Segregate and execute approved action
Reconciliation and disposition record
Material owner
No instruction before storage limit or closeout
The matrix should also identify the response route. A receiving hold may need an OEM material contact within a defined project window. A freight claim may require photos and carrier records. A technical identity conflict may need design approval rather than purchasing approval. Writing these routes before shipment avoids searching for authority while material waits in quarantine.
How Should the Shipment Manifest Identify Every Line and Lot?
A manifest is useful only when its rows can be reconciled with physical packages. Each row should include the BOM line or customer item number, full manufacturer part number, shipped quantity, unit of measure, package type and the number of handling units. Add lot or date-code information only where the project requires it, but keep that information at the correct population level. One lot value should not be applied to several reels unless the labels support it.
The handoff record should name the material owner, counted quantity, allowed attrition, shortage rule, and receiving disposition. Assign a unique shipment or container reference and place it on the paperwork and outer package. For multiple boxes, list which material is in each box. For partial reels, opened trays or cut tape, state the remaining quantity and how identity has been preserved. A handwritten quantity without a traceable package reference creates a count that cannot be independently verified later.
The manifest should be a controlled record. When a count changes before pickup, revise the file or issue a clearly referenced correction. Do not send one quantity by email, another on the packing list and a third in the ERP export without resolving which value controls acceptance.
Carry Condition and Handling Evidence with the Material
The required evidence depends on the component and project. At minimum, the handoff should let receiving identify the outer package condition and the component package unit. When the project controls moisture exposure, electrostatic protection, seal condition, programming, serialization or storage temperature, the shipment record should include the evidence needed to evaluate that condition.
Define the receiving checks, evidence, sampling boundary, and reject route before the shipment arrives. Photos can document the state of a shipment at handoff, but they should show a referenced package and date. A generic photo of a sealed box does not prove which reel was inside. Likewise, a label image is not a substitute for an approved MPN record. Use photos as supporting evidence and keep the primary identity in the manifest and released material definition.
If required history is missing, the review needs a defined disposition path: hold pending evidence, perform an approved verification step, replace the material or obtain a written deviation from the authorized owner. The EMS provider should not invent exposure time, storage history or package condition from appearance alone.
Set Quantity, Attrition, and Shortage Rules in the Consigned Parts Buyer Review
Start with demand by BOM line: placements per assembly multiplied by released build quantity. Then add only the project-specific allowances needed for setup, inspection, handling, expected process loss, destructive verification or service stock. Record each allowance separately so the OEM can see why the required shipment quantity exceeds the net placement count.
A blanket overage percentage hides the reason for the allowance and may fail for high-value or low-quantity parts. One extra tray may be the practical minimum for a package even when a percentage produces a fraction. Another part may be manually installed with no feeder setup but require samples for incoming verification. The agreed rule should state the unit, rounding method and owner of any exception.
BOM line
Full MPN
Build demand
Project allowance
Shipped quantity
Count result
Acceptance or action
Line reference
Manufacturer orderable number
Placements × released build
Named reason and quantity
Manifest quantity
Receiving count within agreed method
Accept, hold or request replenishment
Partial package
Identity preserved on package
Required usable quantity
Handling or setup rule
Declared remainder
Verified remainder or variance
Approve use boundary or segregate
Serialized/programmed item
Approved hardware and program identity
Released population
Replacement or verification stock
Unit serial list
Serials reconciled
Release only matched units
Short shipment
Correct approved identity
Uncovered demand shown
No assumed substitution
Actual received quantity
Shortage confirmed
Replenish, reduce build or approve another written plan
Define what happens when the shipment is short. Options may include replenishment, reducing the build quantity, splitting the run or approving a separately controlled source. The chosen action must preserve MPN, source and effectivity approval. An EMS provider’s stock should not be inserted into a consigned line merely because it appears similar.
Set Receiving Checks for the Consigned Parts Buyer Review
Receiving needs a checklist that matches the shipment requirements. Typical checks include container reference, package damage, manifest match, manufacturer and part number identity, quantity and any project-required lot, date-code, seal, exposure or serialization data. State which checks are visual, counted, sampled or document based.
A pre-shipment review should identify package form, reel orientation, feeder needs, and any preparation the receiving line must perform. The review should define when the EMS provider reports an exception and what evidence accompanies the report. A useful exception record identifies the shipment, affected package, observed condition, count or identity conflict, photos where helpful and the material population placed on hold. It also names the person who can accept, replace or reject the material.
A rejection window should be realistic for the agreed checks and project timing. Do not promise that every latent defect can be found at receiving. The written scope should distinguish a receiving mismatch from a later process or functional finding and explain how each enters the disposition route.
How Are Alternates, Mixed Lots and Revision Changes Approved?
Close the consigned parts buyer review with received quantity, accepted population, rejects, attrition, remaining balance, owner, and disposition route.
Consignment does not bypass engineering approval. If a shipment contains an alternate manufacturer, suffix, package or programmed revision, compare it with the released BOM and approval record before acceptance. Purchasing convenience, a distributor cross-reference or prior use on another product does not establish effectivity for the current build.
Mixed lots or date codes may be acceptable in one project and restricted in another. Record the rule before shipment and keep the physical population separable when the decision is pending. If traceability is required, the receiving and kitting records must preserve the link between the material population and the assemblies that used it.
Keep the source and approval record connected to manufacturing through the BOM sourcing-to-manufacturing handoff . A late change should identify the approved part, affected BOM revision, effective units or lots, remaining old material and disposition of any superseded stock.
Decide Surplus, Scrap, Returns, and Claims in the Consigned Parts Buyer Review
The review must continue beyond receiving. Define how issued quantity, returned quantity, documented process loss and completed-assembly consumption will be reconciled. The purpose is not to assume a perfect one-to-one count. It is to provide a traceable explanation for the balance.
Agree how lots stay separated and how unused, suspect, damaged, or excess material will be counted and returned. For surplus material, state whether it is returned, retained for a later order, transferred to service stock or disposed of under written instruction. Identify packaging requirements for returns and the records that accompany open or partial packages. For scrap, define who can authorize disposition and whether any evidence, quantity record or physical return is required.
Freight damage and source-quality claims may follow different routes. Preserve the package, labels, photos and carrier documents needed for the applicable decision. Do not mix a logistics claim with a technical approval. The person who can approve continued use may not be the person who settles commercial responsibility.
Complete the Consigned Parts Buyer Review Before Shipment
Close the review with a line-by-line readback. Confirm the released project identifiers, consignment model, material list, manifest fields, condition evidence, quantity calculation, receiving checks, exception route and closeout rule. Every open field should have an owner and due date. A pending item stays pending; silence does not convert it into approval.
Confirm customer-supplied material at the PCBA pilot-run readiness gate before the production slot is treated as ready. The gate should show whether the material is shipped, received, accepted, held or awaiting a decision. This status prevents a calendar date from being mistaken for material readiness.
The final record should be readable by purchasing, receiving, quality, engineering and production without relying on a private conversation. If another person cannot trace why a package was accepted and for which build, the handoff is not closed.
Frequently Asked Questions
Does consignment make the OEM responsible for every assembly loss?
No. Material ownership does not by itself allocate every process loss or commercial responsibility. The OEM and EMS provider should agree the expected allowance, count method, exception evidence and responsibility boundary in writing. Actual loss should be reconciled against the affected line and process record rather than assigned from a general assumption.
Can partial reels or opened trays be consigned?
They can be considered when identity, quantity, package condition and required history remain verifiable. The review should state how the remainder was counted, how the package is labeled and protected, and whether the receiving and production equipment can use that format. If the identity or condition boundary is unclear, place the material on hold.
How much overage should an OEM provide?
There is no single rate that fits every component and build. Calculate net demand first, then add named allowances for the package, setup, inspection, handling and approved contingency. Round according to the actual package unit and record who approved the quantity. High-value, serialized or scarce parts may need a unit-based plan instead of a percentage.
When does responsibility for consigned material transfer?
The answer comes from the written project and commercial terms. Ownership, physical custody, risk of loss, acceptance and authority to use or dispose of material may transfer at different events. Name those events and the required evidence. A carrier pickup or warehouse receipt should not be treated as a universal answer.
Prepare the Consigned-Material Handoff
Before shipping customer-owned material, provide the released BOM and AVL, full manufacturer part numbers, quantities, required lot information, packing list, condition history, expected allowance and return instructions. Ask for a written review that returns the receiving criteria, responsibility matrix, exception route and every open decision before pickup.
The owner-supplied photographs provide material-handoff context only. They do not establish facility ownership, certification scope, customer approval, or project performance.
Review the consigned-material handoff with GNS .
