Connector Identification Workflow

This is the short version of the identification process both tracks use. Whether the mystery part came off a cheap LED string or a fielded harness, the steps are the same. Only the stakes — and the amount of paperwork — change.

1. Identify the use case and risk level. Bench prototype or fielded hardware? That decides how much of this list is negotiable — and which track you're in.
2. Count positions — every cavity, loaded or not.
3. Measure the pitch with calipers, across the full row ÷ (N−1). See Pitch: The Number That Saves You.
4. Determine the connection type — wire-to-board, wire-to-wire, board-to-board, or panel/feedthrough.
5. Identify the latch, keying, and polarization — friction vs. positive latch, polarizing features.
6. Identify the housing and the contacts separately — separate part numbers, independent genders (glossary).
7. Check the wire gauge and insulation range the contacts actually support.
8. Check current, voltage, environment, and mating cycles against the application — from a datasheet, not a listing (ratings are system-level).
9. Find the exact mating part from the family drawing. See Buying the Right Mating Parts.
10. Verify with the datasheet drawing or standard — dimensions against your calipers, not photos against your memory.
11. Buy samples or test-fit before committing — before the bulk order on the hobby side, before release on the engineering side.

Measure across several contact centers, then divide by the number of intervals. This averages the measurement error that makes adjacent-pair caliper readings misleading.

Going deeper

• Hobby track: the full How to Identify an Unknown Connector — photos, molded markings, search-query patterns, and marketplace skepticism.
• Engineering track: How to Search for Connectors for requirement-driven search, and Reading Datasheets for what to do once you find the drawing.