---
title: "What should I include when requesting a quote for custom electrical components?"
description: "A project engineer struggles with inconsistent quotes for a UL94-rated plastic housing. The analysis breaks down cost drivers, lead time factors, and provides a concrete framework for supplier evaluation to make an informed sourcing decision."
url: "https://www.ok-tool.com/qa/request-quote-custom-electrical-components.html"
language: "en"
type: "Q&A"
category: "General Manufacturing Q&A"
datePublished: "2026-10-05"
dateModified: "2026-10-05"
brand: "OK TOOL"
manufacturer: "OK TOOL"
answerCount: 7
---

# What should I include when requesting a quote for custom electrical components?

## Question

 I'm the project engineer for a new line of industrial sensor housings. We're finalizing the design for a two-part polycarbonate enclosure that needs to meet UL94 V-0, have integrated mounting bosses, and maintain critical dimensions for PCB fit within ±0.2mm. My pain point is the wild inconsistency in the quotes I'm getting. One factory came in 40% lower than the others but quoted a mold lead time that seems impossibly short. Another provided a very high quote but with a detailed breakdown, while a third gave a single lump sum with no details at all. I need to make a recommendation soon, but I don't have a clear framework to judge what's reasonable. Beyond the obvious price and lead time, what specific parameters and data should I be demanding from these factories in their quotations to accurately compare them and avoid hidden costs or delays down the line? I feel like I'm comparing apples to oranges and it's holding up our entire launch timeline. 

## Answers
                            
### Answer 1 — Best Answer

Your frustration is common when sourcing custom components without a standardized request for quotation (RFQ). The key is to structure your RFQ to force apples-to-apples comparisons. First, solidify your requirements document. Beyond the UL94 V-0 rating and the ±0.2mm tolerance, explicitly state the expected annual volume (e.g., 50,000 units/year), the required material grade (e.g., PC with specific UV or impact modifiers), surface finish (textured, gloss), color (Pantone or RAL), and any critical cosmetic zones. Include the 3D CAD file (STEP or IGES) and a 2D drawing with all critical-to-function dimensions clearly flagged. This eliminates ambiguity and allows factories to base their quotes on identical specifications.

With a clear RFQ, you can dissect the quote. A responsible quote from a manufacturing partner should have a clear, line-item breakdown. Scrutinize the **mold cost and ownership terms**. Is it a one-time NRE (Non-Recurring Engineering) cost? Who owns the mold? Where will it be stored? A suspiciously low mold cost often indicates lower-grade steel or simplified cooling, leading to shorter mold life and potential part quality issues in mass production. The unit price should be broken down by projected volume tiers (e.g., 5k, 25k, 100k pcs). This reveals their cost structure and scalability. For your material, ask for the raw material brand and grade they are quoting (e.g., Covestro PC, Sabic Lexan). A quote that just says "Polycarbonate" is a red flag; the cost difference between generic and certified flame-retardant grades is significant.

Now, analyze the lead time. A realistic timeline for a medium-complexity injection mold for such a part is 8-12 weeks for tool fabrication, followed by 2-3 weeks for first-article samples and approval. A quote promising a mold in 4 weeks likely means using a pre-existing base or compromising on quality. The quote should separate **mold fabrication lead time, sample lead time, and mass production lead time**. It should also specify the number of free sample iterations included and the cost/time for additional changes. A factory that doesn't clarify this is setting the stage for change order fees later.

Finally, use the quotation as a proxy for supplier capability. A detailed, transparent quote suggests organized engineering and project management. A vague quote suggests the opposite. When you receive the quotes, your evaluation checklist should include: Is the mold cost and payment schedule clear? Is the unit price broken down by volume? Is the material specification explicit? Are lead times broken into phases? Are packaging options and costs specified? Are there any minimum order quantity (MOQ) constraints per production run? The factory that provided the high-but-detailed quote is likely showing their professionalism and accounting for robust processes. The impossibly fast, cheap quote almost certainly involves corners being cut, most likely in mold durability or material certification, which will cause failures during your ramp-up. Your safest path is to shortlist based on quote clarity, then initiate a technical review with the top contenders to discuss their mold design approach, quality control plan for your critical dimensions, and their process for verifying UL94 compliance through material certs and in-house testing.

**status:** accepted
**Author:** Kevin Liu
**Date:** 2026-10-05

### Answer 2

Look beyond the quote document to the underlying production stability. Request their control plan for your part. A capable factory should outline their in-process quality checks (IPQC). For your ±0.2mm requirement, ask how they will monitor and control it—what measurement tools (e.g., CMM, optical comparators), what sampling frequency, and what is their reaction plan if a drift is detected.

Inquire about their first-article inspection (FAI) report format. Will they provide a dimensional report against all drawing dimensions, or just a sample part? A red flag is a factory that cannot describe their process capability (Cp/Cpk) for critical dimensions.

Also, clarify defect classification: what do they classify as a minor, major, and critical defect? Their acceptable quality level (AQL) for visual and dimensional inspection should be stated. This due diligence reveals whether the quoted price includes sustainable quality control or if it assumes a "ship and hope" approach that will burden your incoming inspection.

**status:** suggested
**Author:** Daniel Yang
**Date:** 2026-10-05

### Answer 3

Focus on the prototype and pre-production phase. A strong partner will propose a staged sample process: first, a 3D-printed or soft-tooled prototype for form and fit, followed by a first-shot sample from the production mold for functional validation. Ask for their typical turnaround for these stages.

Crucially, discuss the test plan for the UL94 V-0 samples. Will they submit samples from the production mold material to a third-party lab, or do they rely on supplier certs? For fit, request a dimensional analysis report of the first articles.

Evaluate their responsiveness to engineering change requests during sampling. A factory that charges exorbitantly for minor drawing revisions or adds weeks of lead time for each iteration may lack flexible engineering support, which is critical for a successful launch.

**status:** suggested
**Author:** Emily Chen
**Date:** 2026-10-05

### Answer 4

Do not overlook packaging and logistics, as damage in transit can nullify all prior quality efforts. The quote should include packaging details and cost. Ask for their proposed internal packaging (e.g., foam inserts, bubble wrap, compartmented boxes) and master carton specification.

For electrical components, moisture barrier protection might be necessary. Request a photo or diagram of the packed product. Inquire about labeling requirements—can they accommodate custom barcode, part number, and date code labels?

Also, clarify the packed quantity per carton and its alignment with your MOQ to avoid partial pallets. Understanding their standard packaging versus custom solutions helps identify potential hidden costs and ensures your parts arrive undamaged and ready for assembly.

**status:** suggested
**Author:** Eric Zhao
**Date:** 2026-10-05

### Answer 5

Assess their project management framework. A reliable factory will outline key milestones: mold design review completion, mold base procurement, T1 sample date, sample approval, and production readiness review.

Ask how they communicate progress—is there a dedicated project manager providing weekly updates with photos or reports? Crucially, discuss their change order process. What constitutes a minor vs. major design change, and what are the associated cost and timeline impacts?

Understanding their formal sample sign-off procedure is vital; a clear approval process prevents misunderstandings about what constitutes an accepted sample. This structured approach is a strong indicator of a factory that can manage complexity and adhere to schedules, reducing program risk.

**status:** suggested
**Author:** David Zhang
**Date:** 2026-10-05

### Answer 6

Conduct a virtual or on-site process audit. Request a video tour of their injection molding shop focusing on machines with similar tonnage to what your part requires. Observe housekeeping and material handling.

Ask about their preventive maintenance schedule for molds and machines. Inquire about their material drying and handling process—improper drying of polycarbonate leads to splay and weak parts. A critical risk signal is if they cannot show you their mold storage area or explain their system for mold maintenance between runs.

Check if they have dedicated quality stations with calibrated equipment. This assessment verifies if their quoted price is supported by a controlled manufacturing environment or if it's predicated on a disorganized shop floor with high variability.

**status:** suggested
**Author:** Jason Zhou
**Date:** 2026-10-05

### Answer 7

Validate the design for manufacturability (DFM) and assembly. A competent application engineering team should provide a DFM report highlighting potential issues like wall thickness variations, sink marks near bosses, or ejection pin marks in cosmetic areas. They should advise on gate location to minimize visual defects and ensure proper filling.

For your two-part enclosure, their feedback on the snap-fit or screw boss design is crucial—will it withstand repeated assembly? Ask for their recommendation on tolerances for the interfacing features. This collaborative review ensures the part is not only manufacturable but also assemblable and functional in your end product, preventing costly redesigns after tooling has been cut.

**status:** suggested
**Author:** Sophia Wang
**Date:** 2026-10-05

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