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Drawing and RFQ checklist

Liquid Cooling Manifold Manufacturing Checklist

Liquid cooling manifold manufacturing starts with controlled ports, passages, sealing interfaces, materials, inspection, and defined test scope.

8 minute readUpdated September 28, 2026
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machined aluminum manifold block with multiple customer-defined ports
Figure 1. Machined aluminum manifold block with customer-defined ports.

How to use this guide

Use it with the liquid cooling component manufacturing page, review the relevant CNC machining capability, then prepare the controlled files and acceptance criteria before submitting an RFQ.

Step 1: Architecture

Freeze the manifold architecture first

The customer controls the fluid circuit, connection scheme, service strategy, and rack interfaces.

Provide a controlled passage map that identifies every inlet, outlet, branch, cross-drill, plug, drain, vent, sensor feature, and mounting interface.

Reference the OEM-selected rack or cooling architecture where useful, but place the actual project requirements on the released drawing and specification.

  • Inlet, outlet, and branch mapping
  • Cross-drill and closure strategy
  • Drain, vent, and sensor provisions
  • Mounting and service interfaces
manifold port face with machined threads and sealing grooves
Figure 2. Manifold port face with threads and sealing grooves.
Step 2: Ports and seals

Fully define ports and sealing interfaces

A nominal thread name rarely defines the complete functional interface.

Specify thread standard and class, depth, lead-in, spotface, sealing method, groove geometry, surface finish, and any clocking or orientation requirement.

Identify the exact datum scheme used to locate ports relative to mounting and mating features. Do not make the supplier infer seal compression or connector engagement.

  • Thread form, class, and engagement depth
  • Seal type and groove definition
  • Mating-face finish and geometry
  • Port location and orientation datums
InterfaceRequired control
Threaded portStandard, class, depth, spotface, and gauge
Seal grooveGeometry, finish, and datum relationship
Mounting faceFlatness or profile only when function requires it
Diagram of the drawing callouts needed for ports, passages, sealing faces, datums, and test scope
Figure 3. Manifold callout map for functional interfaces and inspection requirements.
Step 3: Manufacturing

Review access, deburring, and closures

Long passages and intersecting bores create tool-access and debris-removal questions.

Discuss tool reach, drill wander risk, burr access, plug installation, and inspection access during DFM. Critical intersections should be visible in section views or a passage table.

State material, finish, masking, and objective cleanliness requirements. If a process is mandatory, identify it rather than relying on a generic clean-part note.

  • Tool access and passage depth
  • Deburring at intersections
  • Closure hardware and installation scope
  • Finish, masking, and cleanliness criteria
manifold block in an inspection fixture with a CMM probe parked above
Figure 4. Manifold block in an inspection fixture with a CMM probe above.
Step 4: Acceptance

Separate dimensional acceptance from functional tests

Dimensional inspection verifies drawing features; functional testing needs its own procedure.

Request inspection records for critical port, face, and mounting geometry as needed. Specify gauges or methods when the standard requires them.

Pressure, proof, leak, flow, burst, cleanliness, and thermal tests are not implied. Define each requested test with medium, limits, duration, temperature, sample plan, fixture responsibility, and report format.

  • Critical-feature inspection plan
  • Thread or port gauge requirements
  • Separately defined functional-test procedure
  • Customer approval of deviations and results

The checklist supports a customer-owned design

  • MakerStage reviews the supplied manifold for manufacturability
  • The OEM owns fluid architecture and functional requirements
  • Dimensional reports and material records are available on request
  • Pressure, leak, flow, cleanliness, and thermal tests require separate scope

Technical references

These primary references provide system context. Project requirements still belong in the customer-controlled drawing and specification.

Common Questions

Frequently Asked Questions

What is the minimum manifold RFQ package?
Provide a controlled 3D model, drawing, passage map, material, port and seal definitions, finish, quantity, revision, critical characteristics, cleanliness criteria, and any separately defined test procedure.
Is leak testing automatically included?
No. MakerStage’s verified scope here is component manufacturing plus requested dimensional or material records. The OEM or a separately qualified provider must own leak testing and its acceptance criteria.
Why include a passage map?
It helps the supplier understand how cross-drills and branches connect, plan tool access and deburring, and identify closures without inferring fluid-circuit intent.

Related Resources

Liquid Cooling Components
Understand component-level machining scope.
Cold Plate Considerations
Define plate channels and interface surfaces.
OEM RFQ Checklist
Package files and acceptance criteria.

Bring a controlled component package

Upload the model, drawing, quantity, revision, and requested records. MakerStage will review manufacturability against the supplied scope.

Start an RFQ