Terminal Component Drawing Review Checklist for OEM RFQs
Use this terminal component drawing review checklist to control revisions, interfaces, critical features, material, finish, assembly notes, and RFQ questions before sampling.
A terminal component drawing is ready for an OEM RFQ when another person can identify the part, revision, mating interfaces, features that matter, and questions still requiring engineering review. The drawing does not need every decision to be closed, but it must make open decisions visible before a quote or sample is treated as controlled.
Our supplier view is simple: review the interfaces and revision status before debating material or finish. A polished drawing with an unclear thread, panel fit, datum, or assembly stack can still produce the wrong sample.
Start with drawing identity and revision control
Use this first-pass checklist before discussing individual dimensions:
| Drawing control | What to check | If it is missing |
|---|---|---|
| Part number and name | The drawing identifies the terminal, insulator, hardware or assembly being reviewed | Link the file to the RFQ line item and reference part |
| Revision and date | The revision agrees with the RFQ, sample label and BOM | Stop comparison until the current revision is confirmed |
| Units and projection | Units, projection method and sheet scale are stated | Ask the buyer to confirm interpretation; do not infer from the PDF scale |
| Status | Draft, quotation, sample, approved or obsolete status is visible | Keep the file as review-only until release status is known |
| Change description | The change note explains what moved from the previous revision | Compare the changed feature and any affected mating part |
| Related documents | BOM, assembly view, finish note and inspection reference are linked | List the missing document as an open RFQ question |
Treat a drawing revision as a control decision, not a file-name decoration. If the sample, BOM and drawing use different revisions, record the mismatch before a supplier is asked to confirm fit.
Mark the interfaces before reviewing dimensions
The same terminal can be acceptable in one assembly and unusable in another because the mating parts and installation sequence differ. Mark the interfaces on the drawing or in an attached review sheet.
| Interface | Questions for the review | Useful input |
|---|---|---|
| Contact or mating face | Which face, bore, post or socket carries the connection? What part touches it? | Mating plug, lug, wire, busbar or terminal reference |
| Thread and hardware | Is the thread internal or external? Which nut, screw, washer or insert is used? | Thread callout plus mating hardware or approved sample |
| Panel fit | What passes through the panel? Which shoulder, nut seat and washer stack control installation? | Panel thickness, hole, enclosure and assembly section |
| Insulation interface | Does a cap, bushing, washer or molded shoulder locate the part? | Insulation drawing and assembly order |
| Rear termination | Does the back end accept a wire, lug, PCB feature or another component? | Rear view, termination method and clearance envelope |
The custom terminal components page provides the correct project context for drawing review and samples. For process-specific questions, connect the drawing to CNC machining, plating or injection molding instead of treating every feature as a generic machining request.
Separate critical features from reference dimensions
Not every dimension has the same release consequence. Ask the buyer and supplier to separate features that control fit or function from dimensions that explain the general form.
| Feature group | Why it may matter | Review question |
|---|---|---|
| Mating diameter, thread or pitch | Controls engagement with another part | What mating part and acceptance check will be used? |
| Panel hole, shoulder and stack height | Controls installation and visible position | Has the real panel, washer and nut arrangement been checked? |
| Contact face or bore | Controls the intended interface | Which surface is functional, and how will it be protected and inspected? |
| Insulation seat or clearance | Controls assembly and isolation geometry | Is the mating insulator included in the sample review? |
| Appearance or finish zone | Controls visible result, not necessarily fit | Is there an approved appearance reference and a separate functional finish note? |
| General outline | Describes form but may not define acceptance by itself | Is it a critical feature, reference dimension or visual guideline? |
Do not invent a tolerance when the drawing does not provide one. Record drawing tolerance required, supplier review required, or another agreed status. Exact tolerances, inspection methods and acceptance limits need the buyer’s controlled drawing or engineering approval.
Add material, finish and assembly notes
A drawing review should connect geometry to the decisions that change manufacturing or approval. Use this field block when preparing the RFQ:
Base material or alternatives under review:
Contact / mating surfaces:
Appearance surfaces and finish reference:
Protected, masked or untreated zones:
Insulator, washer, nut and hardware relationship:
Assembly sequence and orientation:
Critical features requiring inspection:
Reference sample or approved photo:
Open engineering questions and owner:
Material and finish should not be inferred from a color name or a photograph. Identify whether the finish applies to a contact zone, visible zone, thread, protected surface or a combination. If the process route is not approved, keep it as a review question and link to the relevant capability page.
The terminal component plating guide explains why contact and appearance zones should be separated. The sample approval checklist handles the later question of how a physical sample is compared and released. This article stops at drawing readiness and does not claim that either document substitutes for project approval.
Release a drawing for RFQ or sample review
Before sending the package, run the following sequence:
- Freeze the reference set. Name the part number, drawing revision, BOM revision, sample identity and related files.
- Mark interfaces. Add the mating parts, panel/enclosure context, thread, insulation and rear termination information.
- Classify features. Identify critical, reference, appearance and open-review features without adding unsupported tolerances.
- Attach the decision fields. Include material, finish zones, assembly order, quantity stage, inspection questions and packaging assumptions.
- Log unresolved items. Assign each open question to the buyer, supplier or engineering reviewer; do not hide it in a generic note.
- Send the controlled package. Use Send Drawing for Engineering Review when the drawing, sample or marked photograph is ready for an RFQ discussion.
For the full quotation package, use How to Prepare a Terminal Component RFQ Package. For a physical sample decision, use the sample-approval article after the drawing and reference set are identified. Keeping these steps separate makes it easier to tell whether a problem came from the drawing, the sample, the manufacturing process or the approval method.
This checklist is a preparation aid for OEM terminal-component discussions. It does not establish universal tolerances, electrical ratings, certifications, test results, MOQ, lead time or guaranteed manufacturing capability. Project-specific drawing interpretation, material, finish, inspection and approval require buyer and supplier engineering review.