--- title: What Class 1, Class 2, and Class 3 Means When Evaluating IPC-A-610, IPCWHMA-A-620, and J-STD-001 description: Understand the importance of IPC-A-610, IPC/WHMA-A-620, and J-STD-001 workmanship classes to ensure product quality and reliability in electronic manufacturing. image: https://www.agilitytech.net/hubfs/IPC-610-Agility%20Tech_class-123-b.jpg --- [Skip to content](https://www.agilitytech.net/blog/what-class-1-class-2-and-class-3-means-when-evaluating-ipc-a-610-ipcwhma-a-620-and-j-std-001#main-content) [![at-logo-header](https://www.agilitytech.net/hubfs/at-logo-header.png)](https://www.agilitytech.net) - About - [Who We Are](https://www.agilitytech.net/who-we-are) - [What We Do](https://www.agilitytech.net/what-we-do) - [Testimonials](https://www.agilitytech.net/agility-tech-the-voice-of-the-customer) - [Capabilities](https://www.agilitytech.net/capabilities) - [Capabilities Overview](https://www.agilitytech.net/capabilities) - [Electro-Mechanical Assembly & Box Build](https://www.agilitytech.net/electro-mechanical-assembly) - [Custom Cables & Wire Harnesses](https://www.agilitytech.net/custom-cable-and-wire-harness) - [Molded Cable Assemblies](https://www.agilitytech.net/molded-cable-assemblies) - [RF-Coaxial Cable Assemblies](https://www.agilitytech.net/rx-coaxial-cable-assemblies) - [Ribbon Cables & Coil Cords](https://www.agilitytech.net/ribbon-cable-and-coils) - [Fiber Optic Assembly](https://www.agilitytech.net/fiber-optic-assembly) - [Wire & Cable Processing](https://www.agilitytech.net/wire-processing) - [Bare PCB, Flex, Semi-Flex & Rigid-Flex](https://www.agilitytech.net/bare-printed-circuit-board) - [Printed Circuit Board Assembly](https://www.agilitytech.net/potted-and-pcb-assemblies) - [Power Supplies](https://www.agilitytech.net/custom-power-supplies) - [Low Pressure Molding](https://www.agilitytech.net/low-pressure-molding) - [Injection Molded Plastic Parts](https://www.agilitytech.net/injection-molded-plastic-parts) - [Precision Metal Fabrication & Machining](https://www.agilitytech.net/precision-metal-fabrication-machining-duplicate) - Global Mfg - [North America](https://www.agilitytech.net/global-partners) - [Off-Shore](https://www.agilitytech.net/offshore) - [Mfg Services](https://www.agilitytech.net/mfg-services) - [IIoT](https://www.agilitytech.net/preddio-simplicity-iot-overview) - [SIMPLICITY IoT by Preddio Overview](https://www.agilitytech.net/preddio-simplicity-iot-overview) - [Preddio Cloud & Mobile Platforms](https://www.agilitytech.net/preddio-simplicity-cloud-mobile-platforms-at-a-glance) - [BrewOps by Preddio](https://www.agilitytech.net/brewops-by-preddio) - [SIMPLICITY by Preddio - Insights & Benefits](https://www.agilitytech.net/simplicity-by-preddio-insights-benefits-example-applications) - [Preddio FAQs](https://www.agilitytech.net/faqs) - [Industries](https://www.agilitytech.net/industries) - [News/Blog](https://www.agilitytech.net/blog) - [Contact Us](https://www.agilitytech.net/contact-us) - [RFQ](https://www.agilitytech.net/rfq) English # What Class 1, Class 2, and Class 3 Means When Evaluating IPC-A-610, IPCWHMA-A-620, and J-STD-001 [Agility Tech](https://www.agilitytech.net/blog/author/agility-tech) Oct 30, 2026, 12:34:35 PM - [Tweet](https://twitter.com/share) ## **How to Specify the Correct Workmanship Class, and What to Verify Before You Make Your Sourcing Decision** A quote for a new control assembly comes back with a line that just says, “Built to IPC standard.” No class called out. The engineering team assumes that means the good stuff—IPC is IPC, after all—and signs off.Six months into production, units subjected to a vibration-heavy environment start showing cracked solder joints and wire harnesses that are intermittent. Nothing about the build was defective by the workmanship standard the shop actually built to. It just wasn’t the workmanship standard that the application required—because the workmanship class was not specified. First off, IPC-A-610 (commonly referred to as IPC-610) focuses on the end-product acceptability of mounted components, printed boards, and soldered connections on circuit boards, while IPC/WHMA-A-620 (commonly referred to as IPC-620) focuses on crimping, insulation displacement, wire stripping, molding, and securing practices for cables and wiring harnesses. They also cross-reference each other and complement soldering process standards such as IPC J-STD-001. IPC-A-610, IPC/WHMA-A-620, and J-STD-001 are commonly specified on electronics, electro-mechanical, cable assemblies and wire harness RFQ’s and drawings; but often, the workmanship class may not be specified. Here’s what they actually cover, how to specify the correct Workmanship Class, and what to verify before you make your sourcing decision. ## **The Standards, and How They Apply** IPC-A-610, IPC/WHMA-A-620, and IPC J-STD-001 aren’t competing standards—they are complementary standards that cover separate areas:![IPC-610-Agility Tech\_class-123-b](https://www.agilitytech.net/hs-fs/hubfs/IPC-610-Agility%20Tech_class-123-b.jpg?width=750&height=500&name=IPC-610-Agility%20Tech_class-123-b.jpg) IPC-A-610, titled “Acceptability of Electronic Assemblies,” is the global industry standard that defines visual inspection criteria, workmanship standards, and quality requirements for printed circuit board assemblies (PCBAs). It outlines what a finished electronic assembly should look like and provides a common language for manufacturers, inspectors, and buyers to evaluate product quality. It covers topics such as: - **Soldering Requirements:** Specifies criteria for surface-mount (SMD) and through-hole solder joints, leaded and lead-free applications, wetting angles, fillet height, pad fill, and solder bridging. - **Component Placement & Orientation:** Details rules for polarity alignment, lead centering and insertion depth, IC and diode orientation marks, and minimum clearances. - **Cleanliness & Flux Removal:** Sets guidelines for removing flux residues and contaminants to prevent corrosion, short circuits, or dendritic growth. - **Conformal Coating & Encapsulation:** Evaluates the application and quality of protective coatings on assemblies. - **Mechanical Assembly & Hardware:** Covers the mounting of heatsinks, connectors, fasteners, switches, and structural parts. - **Marking & Labeling:** Inspects the clarity, placement, and permanence of serial numbers, part numbers, and warning labels. IPC/WHMA-A-620 is the global industry-consensus standard for the requirements and acceptance of cable and wire harness assemblies. This standard spans 19 chapters and outlines manufacturing, inspection, and testing criteria for:![IPC-620-class-123-Agility Tech](https://www.agilitytech.net/hs-fs/hubfs/IPC-620-class-123-Agility%20Tech.jpg?width=750&height=500&name=IPC-620-class-123-Agility%20Tech.jpg) - **Wire and cable preparation:** Cutting, stripping, and tinning requirements. - **Terminations and crimping:** Terminal crimps, splice crimps, insulation crimps, crimp height, bell-mouth, and conductor visibility. - **Soldering:** Hand soldering, pot tinning, and heat shrink applications. - **Mechanical and electrical interconnections:** Connector assembly, coaxial and biaxial cables, and high-voltage applications. - **Protection and sealing:** Molding, potting, sleeving, strain relief, and protective coverings. - **Bundling and routing:** Wire routing, bundling, lacing, cable ties, and bend radii. - **Marking and labeling:** Wire and harness labels, marking, and lot traceability. - **Testing and inspection:** Electrical testing and visual acceptance rules. IPC J-STD-001 (titled *Requirements for Soldered Electrical and Electronic Assemblies*) is the global industry-consensus standard that defines the **materials, methods, process controls, and acceptance criteria** for achieving reliable, soldered interconnections in electronics manufacturing. It covers topics such as: - **Materials:** Specifications for solder alloys (tin-lead and lead-free), fluxes, solder pastes, adhesives, and cleaning/residue materials. - **General Assembly Requirements:** Facility controls, ESD (electrostatic discharge) safety, thermal and environmental protection, tool requirements, and rework limits. - **Wires and Terminals:** Wire preparation, stripping, tinning, and terminal connection techniques. - **Component Mounting & Soldering:** - Through-hole technology (lead forming, component placement, plated-through-hole fill requirements. - Surface mount technology (SMT) component placement and reflow/machine soldering. - Manual/hand soldering practices. - **Post-Soldering Processes:** Cleaning requirements, conformal coating, encapsulation, and sealants. ## **Choosing the Right Class** These standards all use the same three-class quality tier system (Class 1 for general consumer products, Class 2 for dedicated service/mid-range electronics, and Class 3 for high-reliability mission-critical applications such as aerospace). While Class 1 exists for inexpensive, short-life-cycle consumer items (such as basic toys), most OEM’s and commercial manufacturers prefer to build to Class 2 standards to ensure a baseline level of professional product quality, durability, and reliability. Class 2 is by far the most industry-prevalent workmanship class and most often serves as the standard **default build classification** for the vast majority of electronics contract manufacturers worldwide, unless a customer explicitly requests otherwise, as it typically strikes an optimal balance between high reliability and manufacturing cost. Class 3 is typically reserved for mission-/life-critical applications, such as aerospace and defense, and can increase manufacturing costs by as much as 50% due to the additional documentation, traceability, and process verification requirements, tighter solder tolerances, mandatory x-ray/micro-section sampling, reduced overall yields, etc. The trap runs in both directions: over-specifying Class 3 for something that will sit in a factory, not a flight system, paying for inspection, documentation and traceability rigor the product does not require —or leaving class unspecified and allowing the chosen shop to default to their standard protocol (likely Class 2) when the application requires Class 3. Either way, the fix is the same: the drawings and RFQ should specify the appropriate workmanship class explicitly for the product’s application. **Let’s Take a Deeper Dive** IPC-A-610 and J-STD-001 govern the circuit board and soldered connections. A box-build or electro-mechanical assembly is a higher level assembly that contains connectivity (wiring/cabling, connectorization, etc.), governed by the companion standard IPC/WHMA-A-620, which covers cable and wire harness assemblies specifically—wire and cable preparation, terminations and crimping, connector assembly, protection and sealing, wire bundling and routing, bend radii, marking, labeling and lot traceability, testing and inspection, etc.— with its own Class 1/2/3 workmanship designations mirroring that of IPC-A-610’s workmanship designations. Torque values on fasteners and connectors, and processes, such as conformal coating application, are often called out on the engineering drawing or a customer-specific spec rather than left entirely to the base IPC documents—the RFQ should identify which document governs wherever there’s a contradiction. For higher level assemblies such as box or electro-mechanical builds, a practical question to ask is: does the class quoted for the PCBA match the class being applied to the connectivity and box-build content? ## **What “IPC-Trained” Should Actually Mean** “Our staff is IPC-trained” is one of the easiest claims to make and one of the hardest to verify without knowing what to ask. IPC certification is layered, and these certification layers have different functions: **CIS—Certified IPC Specialist** The operator and inspector level. A CIS holds current certification to apply a specific standard—IPC-A-610, IPC/WHMA-A-620, or IPC J-STD-001 on the production line. This is the credential that should be sitting with the people actually building and inspecting your product. It’s valid for two years. **CSE—Certified Standards Expert** A non-teaching expert role. A CSE has deep, comprehensive knowledge of specific standards and serves as an internal policy/technical authority within an organization. **CIT—Certified IPC Trainer** Certified professionals authorized to train, administer official exams, and certify CIS candidates in-house, for the specific standard or standards they’re required to be certified to. A CIT keeps the CIS credentials of the operators current. **MIT—Master IPC Trainer** Trains CITs, and is tied to an IPC Licensed Training Center. Relevant mainly if a shop runs its own internal IPC training program. “IPC-trained staff” could mean line operators hold current CIS certification in the exact standards your build requires, or it could be misconstrued to mean someone sat through a class once, years ago. Ask for the records specifying how many employees are formally trained/certified, which certification levels they are trained/certified to, and in which standards. ## **Quick IPC Buyer Checklist for a RFQ Response** Use this as a fast pass for any RFQ response referencing IPC standards before you make your sourcing choice: | **Verify This** | **Ask the Quote to Confirm** | | --- | --- | | Class specified | The IPC class (1, 2, or 3) is stated outright and matches your end-use environment; not left blank or assumed | | Standards named | Which standards: IPC J-STD-001 for soldering; IPC-A-610 for PCBA inspection criteria, workmanship standards, and quality requirements, IPC/WHMA-A-620 for the requirements and acceptance criteria of cable and wire harness assemblies | | Class consistency | Example: The class called out for the board should match the class applied to the corresponding cables and wire harnesses and box-build assembly | | Certification level | Operators hold current CIS certification in the standards relevant to your build, not just “IPC training” in general | | Inspection method | Sampling vs. 100% inspection, matched to what your specified class actually requires | | Documentation | Traceability and inspection records included at the depth your required class calls for | ## **Where Agility Tech Fits In** Agility Tech manufactures custom cables, complex wire harnesses, fiber optic assemblies, electro-mechanical assemblies, and full turnkey box build and control panels. [You'll find a comprehensive resource page on our electro-mechanical assembly, box build, and UL 508A control panels here](https://www.agilitytech.net/electro-mechanical-assembly). Our manufacturing plants are ISO 9001, ISO 13485, UL 508A, and C-TPAT certified. We offer personnel certified to IPC-A-610, IPC/WHMA-A-620, and IPC J-STD-001. If you have a design or BOM you’d like reviewed against the right class for your application, [start with our RFQ portal](https://www.agilitytech.net/rfq) or call (774) 847-5533. ## **Frequently Asked Questions** **What’s the actual difference between IPC-A-610 and J-STD-001?** IPC J-STD-001 is the global industry-consensus standard that defines the **materials, methods, process controls, and acceptance criteria** for achieving reliable, soldered interconnections in electronics manufacturing IPC-A-610 is the global industry standard that defines visual inspection criteria, workmanship standards, and quality requirements for printed circuit board assemblies (PCBAs). It outlines what a finished electronic assembly should look like and provides a common language for manufacturers, inspectors, and buyers to evaluate product quality. **How do I know whether my product needs Class 2 or Class 3?** Match the class to how the product will actually be used, not to which class sounds more rigorous. Class 2 is by far the most industry-prevalent workmanship class and most often serves as the standard **default build classification** for the vast majority of electronics contract manufacturers worldwide, unless a customer explicitly requests otherwise, as it typically strikes an optimal balance between high reliability and manufacturing cost. Class 3 is typically reserved for mission-/life-critical applications, such as aerospace and defense, and can increase manufacturing costs by as much as 50% due to the additional documentation, traceability, and process verification requirements, tighter solder tolerances, mandatory x-ray/micro-section sampling, reduced overall yields, etc. **Does IPC-A-610 cover cable and wire harness assemblies too?** No. IPC-A-610 applies to the circuit board assembly. IPC/WHMA-A-620 is the global industry-consensus standard for the requirements and acceptance of cable and wire harness assemblies. IPC/WHMA-A-620 uses its own matching Class 1/2/3 designations. On an electro-mechanical or box-build assembly with PCBA and connectivity content, both standards are usually in play. **What should “IPC-certified” or “IPC-trained” actually mean from an EMS provider?** It should mean the people building and inspecting your product hold current CIS (Certified IPC Specialist) certification in the specific standards your job requires—IPC-A-610, J-STD-001, and IPC/WHMA-A-620. CIT (Certified IPC Trainer) and MIT (Master IPC Trainer) are training-level credentials. Ask for the training records—which level and which standards.   Topics: [Electro-Mechanical Manufacturing](https://www.agilitytech.net/blog/tag/electro-mechanical-manufacturing) [Class 2, Class 3 for IPC-610, IPC-620](https://www.agilitytech.net/blog/tag/class-2-class-3-for-ipc-610-ipc-620) [Evaluating IPC-A-610, IPCWHMA-A-620, and J-STD-001](https://www.agilitytech.net/blog/tag/evaluating-ipc-a-610-ipcwhma-a-620-and-j-std-001) [IPC Buyer Checklist for a RFQ Response](https://www.agilitytech.net/blog/tag/ipc-buyer-checklist-for-a-rfq-response) [« Previous Post](https://www.agilitytech.net/blog/choosing-a-fiber-optic-assembly-manufacturing-partner) [![at-logo-footer](https://www.agilitytech.net/hubfs/at-logo-footer.png)](https://www.agilitytech.net) [774-847-5533](tel:774-847-5533) © 2021 - All Rights Reserved   **Privacy Policy** Agility Tech ensures your privacy by using your information only for agreed purposes and not sharing it with third parties. 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