Factory Manufacturing Floor
    Supply Chain

    Supplier Vetting Guide

    The manufacturer you choose is as important as the design of your part. Learn how to evaluate, qualify, and monitor contract manufacturers.

    Supplier Scorecard Generator

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    Supplier Evaluation Framework

    1. The Supplier Qualification Process

    RFQ stage: qualify suppliers to receive your RFQ based on: minimum process capability, required certifications, geographic preference, minimum capacity (can they handle your volumes?), and financial stability signals.

    Quote evaluation: beyond price, evaluate the technical response — did they ask good questions about your part? Did they identify potential manufacturing challenges? A supplier who just returns a price without engaging technically is a risk.

    Pre-award survey or audit: for significant programs, visit the facility or conduct a remote audit before awarding business. Review quality system documentation, production floor organization, equipment calibration records, and workforce training records.

    First article: use the first article inspection process as a formal gate before authorizing production quantities. A supplier who resists FAI is telling you something important.

    2. The Facility Visit — What to look for

    5S and general organization: a well-organized production floor is one of the strongest leading indicators of quality. Disorganized facilities produce inconsistent quality.

    Equipment condition and calibration: are machines maintained? Is there a visible preventive maintenance program? Are measuring instruments calibrated (calibration sticker with current date)?

    Material identification and segregation: raw material should be labeled with material type, specification, and lot/heat number. Nonconforming material should be clearly identified and segregated.

    First-piece inspection at the machine: do operators inspect the first piece of each setup before running the batch? First-piece inspection catches setup errors before they produce a batch of scrap.

    3. The 20 Questions That Reveal True Capability

    1. What is your on-time delivery rate for the last 12 months? Good: 95%+, knows the number immediately. Red flag: doesn't track it or gives a vague "we're usually on time."

    2. How do you handle a quality escape — a defective part that reaches a customer? Good: immediate containment, root cause analysis, CAPA process. Red flag: vague or defensive.

    3. What happens if you get behind on delivery — how do you communicate and recover? Good: proactive communication, overtime authority, surge capacity plan. Red flag: "it hasn't happened."

    4. What is your tooling ownership policy? Good: tooling paid by customer is customer property, clearly documented. Red flag: tooling stays at their facility with no transfer provisions.

    5. What could go wrong with this part and what are you doing about it? Good: identifies specific technical risks and their controls. A supplier who identifies problems in the RFQ stage saves you from finding them in production. Red flag: "no problems, it's straightforward."

    4. Financial Health & IP Protection

    Financial health indicators: a manufacturer that goes bankrupt takes your tooling, work in process, and committed inventory with them. Watch out for aggressive chasing of payment, unusual terms (100% upfront), or deferred maintenance.

    Non-Disclosure Agreement (NDA): execute before sharing any design data. Should be mutual, cover technical information and business terms.

    Tooling ownership: tooling paid for by you (the customer) is your property. Specify this explicitly in your purchase order.

    Design for manufacture feedback: when a supplier proposes a DFM change to your design, ensure the change is documented, approved, and reflected in updated drawings.

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