{"id":7275,"date":"2026-09-17T06:01:08","date_gmt":"2026-09-17T06:01:08","guid":{"rendered":"https:\/\/ceshi.baoxuanmetal.com\/?p=7275"},"modified":"2026-09-14T06:57:07","modified_gmt":"2026-09-14T06:57:07","slug":"fai-drawing-package-sheet-metal-parts","status":"publish","type":"post","link":"https:\/\/ceshi.baoxuanmetal.com\/de\/fai-drawing-package-sheet-metal-parts\/","title":{"rendered":"Complete FAI Drawing Package for Sheet Metal Parts: Overseas Supplier Checklist"},"content":{"rendered":"

You have selected an overseas sheet metal supplier for a new enclosure project. The quote is competitive, the lead time works, and the engineering team has reviewed the DFM feedback. Before production begins, there is one gate left: First Article Inspection.<\/strong> Your supplier asks for the FAI drawing package \u2014 and you realize you are not sure exactly what to send, how to mark it, or what the supplier should return.<\/p>\n

This gap is more common than it should be. A purchasing team sends a PDF drawing and a material spec, the supplier produces first articles and submits a report, and the buyer discovers that half the critical dimensions were never inspected because they were not flagged.<\/strong> Or the ballooned drawing uses numbering that does not match the Form 3 entries. Or the material certificate references a different lot than the one used for the first articles. Each of these errors costs days of back-and-forth across time zones and delays the production start.<\/strong><\/p>\n

This guide walks through how to prepare, send, and review an FAI drawing package for overseas sheet metal suppliers<\/strong> \u2014 covering the files you need, how to mark critical features, how to communicate requirements across borders, and how to review what comes back.<\/p>\n

What Goes Into an FAI Drawing Package for Sheet Metal Parts<\/h2>\n

An FAI drawing package is the set of documents that tells your supplier exactly what to make, how to measure it, and what evidence to submit before volume production begins.<\/strong> For sheet metal parts, the package has a core set of files that apply to any manufacturing process, plus several additions that address the specific variables of cutting, bending, welding, and finishing.<\/p>\n

The Core Files Every Package Needs<\/h3>\n

At minimum, a complete FAI drawing package for a sheet metal part should include:<\/p>\n

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  • 2D engineering drawing (PDF)<\/strong> \u2014 fully dimensioned with tolerances, GD&T callouts, datum references, material grade, finish requirements, welding symbols, and hardware specifications. This is the single source of truth for the inspection.<\/strong><\/li>\n<\/ul>\n
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    • 3D CAD file (STEP format)<\/strong> \u2014 for complex geometries where the 2D drawing alone does not fully describe the formed shape. STEP is the most universally compatible format across CAD systems.<\/li>\n<\/ul>\n
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      • Material specification<\/strong> \u2014 stating the exact grade, temper, and thickness. Not “steel” but “SPCC cold-rolled steel, 1.5 mm” or “5052-H32 aluminum, 2.0 mm.”<\/strong> Include the material standard reference (e.g., ASTM A1008, EN 10130).<\/li>\n<\/ul>\n
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        • Surface finish specification<\/strong> \u2014 the finish type (powder coat, zinc plating, anodize), color code (RAL, Pantone, or custom), coating thickness range, and any appearance standards or approved samples.<\/li>\n<\/ul>\n
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          • Quality requirements summary<\/strong> \u2014 specifying whether FAI is required, which reporting format to use (AS9102 forms, PPAP, or supplier’s internal format), critical-to-quality features, AQL levels for batch inspection, and required certifications (mill certificates, plating reports, weld qualifications).<\/li>\n<\/ul>\n
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            • Hardware and assembly list<\/strong> \u2014 identifying PEM nuts, studs, standoffs, hinges, gaskets, labels, and any components the supplier must install versus components you supply separately.<\/li>\n<\/ul>\n
              \"Required

              The core engineering, material, finish, quality, and sheet metal documents required for a complete FAI package.<\/span><\/p><\/div>\n

              This package is your primary communication tool. When it is incomplete, the supplier fills gaps with assumptions \u2014 and assumptions are the leading cause of non-conformances in first articles.<\/strong><\/p>\n

              Sheet Metal\u2013Specific Additions Most Buyers Overlook<\/h3>\n

              Sheet metal fabrication introduces variables that machined or molded parts do not. Your FAI package should account for these with additional documentation:<\/p>\n

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              • Flat pattern drawing or DXF<\/strong> \u2014 showing the unfolded geometry with bend lines, bend directions, and bend allowances. This is especially important for parts with complex bend sequences, where the flat pattern directly affects hole positions after forming.<\/li>\n<\/ul>\n
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                • Bend data table<\/strong> \u2014 listing bend angles, inside radii, and bend-to-edge distances for each bend. If your drawing uses a generic note like “bend to 90\u00b0 \u00b11\u00b0,” consider specifying individual bend tolerances where they matter for assembly.<\/li>\n<\/ul>\n
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                  • Weld map or weld symbol detail<\/strong> \u2014 for welded assemblies, a weld map that identifies joint types, weld sizes, and any non-destructive testing (NDT) requirements. Weld symbols on the drawing are a start, but a separate weld map reduces interpretation errors across language barriers.<\/li>\n<\/ul>\n
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                    • Assembly drawing<\/strong> \u2014 if the part is a multi-component assembly, include an exploded or assembled view showing component relationships, hardware locations, and fit-up requirements.<\/li>\n<\/ul>\n
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                      • Inspection datum reference<\/strong> \u2014 clearly identifying which surfaces or features serve as datums for dimensional inspection. In sheet metal, datum selection affects how the part is fixtured during CMM measurement, and a misunderstood datum can invalidate the entire Form 3.<\/strong><\/li>\n<\/ul>\n

                        These additions are not always necessary for simple brackets or flat panels. But for formed enclosures, welded assemblies, and parts with cosmetic surfaces<\/strong>, omitting them is one of the most common reasons overseas suppliers submit incomplete or incorrect FAI reports.<\/p>\n

                        How to Create a Ballooned Drawing That Suppliers Can Actually Use<\/h2>\n

                        A ballooned drawing \u2014 sometimes called a bubble drawing or inspection drawing \u2014 is a copy of the engineering drawing where every measurable feature is assigned a unique sequential number inside a circle<\/strong> (a “balloon” or “bubble”). These numbers correspond to line items on AS9102 Form 3, creating a traceable link between the drawing and the inspection results.<\/p>\n

                        The ballooned drawing is the inspection map. If a feature is not ballooned, it will not be inspected.<\/strong> This is the single most common source of FAI rejections: the supplier measures every ballooned characteristic, but the buyer expected features that were never numbered.<\/p>\n

                        \"Ballooned

                        A ballooned engineering drawing showing how numbered characteristics correspond to inspection results on Form 3.<\/span><\/p><\/div>\n

                        Ballooning Rules: One Number, One Feature, No Ambiguity<\/h3>\n

                        The principle is straightforward: every dimension, tolerance, note, and specification on the drawing that can be measured or verified gets its own balloon number.<\/strong> This includes:<\/p>\n