- Second-source supplier checklist
Check whether your critical machined parts have a real backup supplier.
A practical checklist for OEMs, machinery builders and industrial operators that rely on precision machined components and cannot afford supplier failure, undocumented process knowledge or reactive ordering.
A second-source supplier is not something to find after the first supplier has already failed. By then the problem is usually compressed into incomplete drawings, unclear inspection requirements, unavailable material history and too much pressure on price and lead time.
What the checklist helps identify
- Single supplier exposure on critical machined components.
- Drawing, material and inspection readiness gaps.
- Parts that should be reviewed before the next urgent order.
- Whether the next step is monitoring, review, first batch or planned supply.
For repeat parts
Not isolated one-off price checks.
For critical machinery
Rotating, reciprocating, vibrating or moving equipment.
For supplier risk
Single-source, lead time or quality exposure.
For planned action
Review before the problem becomes urgent.
- What the result means
One supplier doing the work is not the same as a supply strategy.
The risk is not always visible while the part is still arriving. It appears when lead times stretch, drawings are incomplete, inspection knowledge sits with one person, or the next order is needed faster than the current supplier can respond.
- A critical part has only one qualified machining supplier.
- The current supplier holds process knowledge that is not documented internally.
- Drawings exist, but revisions, materials, finishes or critical features are unclear.
- Repeat parts are ordered only when the machine, assembly or maintenance team needs them.
- Quality issues are tolerated because there is no practical alternative.
- Procurement only starts looking for a backup supplier once the part is already urgent.
- Who should use it
This checklist is for buyers with real component supply exposure.
For repeat shafts, housings, rollers, plates, bushes, spacers, flanges, wear parts and change parts used in build-to-print machinery.
OEM machinery builders
Industrial operators
For repeat shafts, housings, rollers, plates, bushes, spacers, flanges, wear parts and change parts used in build-to-print machinery.
Procurement and engineering teams
For teams that need to separate real supplier risk from routine price checking and uncontrolled drawing circulation.
- What the checklist covers
A practical review before second-source qualification.
The checklist is designed to help the buyer identify which parts should move into a component supply review, not to create a broad drawing dump or a rushed quoting exercise.
Part criticality
What happens if the part is late, wrong, unavailable or no longer supported by the current supplier.
Supplier dependency
Whether supply depends on one shop, one programmer, one undocumented process or one fragile relationship.
Drawing readiness
Drawing revision, material grade, finish, tolerances, datum clarity and missing information.
Inspection clarity
Critical features, first article needs, certificates, traceability and buyer acceptance criteria.
Repeat demand
Batch size, annual demand, service pattern, shutdown timing and reorder behaviour.
Next action
Batch size, lead time, repeat pricing assumptions and future demand can be reviewed with better information.
- Second-source pathway
From checklist to review to controlled first batch.
The aim is to qualify the right backup supply pathway before the current supply position fails.
Complete the checklist
Identify supplier dependency, drawing gaps, repeat demand and consequence of failure.
Select one part or part family
Do not start with every drawing. Choose a part that proves the right technical and supply risk.
Submit a component supply review
Provide enough information for ALE to assess technical, production and commercial fit.
Quote a controlled first batch if suitable
The first batch proves drawing control, machining method, inspection approach and communication rhythm.
Move suitable work into planned supply
Approved parts can move into repeat or second-source supply planning where fit is confirmed.
- Get the checklist
Download the second-source supplier checklist.
Use the checklist to identify whether a critical machined part should stay on a watch list, move into a supply review or be prepared for second-source qualification.
Best use
- Work through one part family at a time.
- Record the current supplier position and drawing status.
- Identify the part that would hurt most if supply failed.
- Use that part as the first candidate for review.
After submitting, the checklist PDF will download automatically and your details will be sent to the Alfred Lewis Engineering team.
- Next step after the checklist
The next step is not to send every drawing for quote.
Identify the part or part family that carries the most supply risk. Then submit that part for a controlled component supply review so technical fit, drawing readiness, inspection needs and repeat demand can be assessed properly.