The process of purchasing operations for custom part needs varies significantly across organizations. Unlike the procurement of raw materials or standard items, there is no one way to handle purchasing transactions for custom parts. Defining standard items and raw materials is relatively simple, but defining a custom part need requires highly specific and detailed explanations along with comprehensive data. Here, we outline the crucial information necessary to receive reliable RFQ responses.

Providing comprehensive technical specifications is essential to ensure suppliers fully understand the requirements of a custom part. Uncertainties in specifications can lead to misunderstandings, production delays, and quality issues.

• 3D CAD Models: Suppliers often prefer 3D models (STEP, IGES, or STL format) for CNC machining or 3D printing. These models help in design visualization and manufacturability analysis.

• 2D Engineering Drawings: If the part requires specific features such as threads, knurling, or precise fits, detailed 2D drawings with accurate dimensions, tolerances, and thread specifications are essential.

• Exploded Views & Assembly Drawings: If the custom part is part of a larger assembly, an exploded view can help suppliers understand fit and function.

• Surface Finish & Post-Processing Requirements: Defining the surface finish condition & post-processing is essential to avoid uncertain quotes, wrong applications and meet function of the part. Example: Passivated, as machined, red anodized, bead blasted etc.

• Material Type & Grade: Specifying standard classifications (ASTM, AISI, ISO, DIN) avoids uncertainties. Example: AISI 316 stainless steel, ASTM A36 carbon steel, or AL6061-T6 aluminum.

• Alternative Material Usage: If an alternative material is acceptable, defining equivalent grades to provide supplier flexibility may also offer advantages to the purchaser.

• Packaging Requirements: Properly defined packaging requirements help avoid surprises. If specific packaging is required, it should be specified during the RFQ phase to assess the supplier’s capability to meet the demand. Example: Individually packaged, PPAP packaging, vacuum packaging, etc.

• Lead Time Requirements: Clearly defined lead time expectations ensure price reliability and supplier alignment.