{"id":5225,"date":"2026-11-01T12:26:29","date_gmt":"2026-11-01T04:26:29","guid":{"rendered":"https:\/\/ptfesuppliers.com\/how-to-send-cad-drawings-for-a-custom-ptfe-parts-quote\/"},"modified":"2026-11-01T12:26:29","modified_gmt":"2026-11-01T04:26:29","slug":"how-to-send-cad-drawings-for-a-custom-ptfe-parts-quote","status":"publish","type":"post","link":"https:\/\/ptfesuppliers.com\/ru\/how-to-send-cad-drawings-for-a-custom-ptfe-parts-quote\/","title":{"rendered":"How to Send CAD Drawings for a Custom PTFE Parts Quote"},"content":{"rendered":"

Short answer:<\/strong> Send a 2D drawing (PDF or STEP) with material grade, all tolerances, quantity, and application temperature\/media \u2014 and state which tolerances are critical. A drawing with three dimensions and “make it like the sample” generates three rounds of questions; a complete RFQ package gets a firm quote in 1\u20132 days.<\/p>\n

PTFE parts are machined from stock shapes, so nearly every custom part starts life as a drawing. The quality of that drawing determines both your price and your risk: ambiguous drawings force suppliers to quote conservatively, which shows up as a higher unit price.<\/p>\n

The Minimum Drawing Package<\/h2>\n
    \n
  1. A dimensioned 2D view (PDF)<\/strong> with all functional dimensions and tolerances marked, including cross-section details for seals or spacers.<\/li>\n
  2. A 3D file (STEP or IGES)<\/strong> whenever the part is not a simple revolve \u2014 suppliers check machinability against it.<\/li>\n
  3. Material callout<\/strong>: virgin PTFE, modified, or a filled grade with filler type and percentage (e.g., 25% glass-filled PTFE).<\/li>\n
  4. Quantity and expected annual volume<\/strong> \u2014 prototype vs production changes the fixturing and quoting logic entirely.<\/li>\n
  5. Service environment<\/strong>: temperature range, pressure, media. This lets the supplier flag grade conflicts before, not after, first article.<\/li>\n<\/ol>\n

    Tolerances: The Part Most Buyers Get Wrong<\/h2>\n

    PTFE machines differently from metals \u2014 it is soft, springy, and moves with temperature. Blanket tolerances of \u00b10.01 mm force scrap rates and prices up. Mark critical functional dimensions (e.g., a seal groove diameter) at the precision you actually need, and leave non-functional features at general tolerance (\u00b10.1 mm is routine for PTFE). Chunhuan routinely holds \u00b10.05 mm on critical dimensions with SPC batch records.<\/p>\n

    Common Drawing Gaps and Their Cost<\/h2>\n\n\n\n\n\n\n
    Missing from drawing<\/th>\nConsequence<\/th>\n<\/tr>\n
    Chamfer\/deburr note<\/td>\nSharp edges on sealing faces; leakage risk discovered at fitting<\/td>\n<\/tr>\n
    Critical vs general tolerance split<\/td>\nOverquoted price, or first article rejected for a dimension that never mattered<\/td>\n<\/tr>\n
    Surface finish callout on sealing faces<\/td>\nWrong tool path; finish rework after delivery<\/td>\n<\/tr>\n
    Lot marking requirement<\/td>\nNo traceability when a field failure needs investigation<\/td>\n<\/tr>\n<\/table>\n

    Checklist Before You Hit Send<\/h2>\n

    Material grade stated \/ critical tolerances marked \/ quantity and volumes included \/ service conditions noted \/ finish and edge requirements called out \/ revision number on the drawing. A one-minute check against this list typically saves a week of back-and-forth.<\/p>\n

    Frequently Asked Questions<\/h2>\n

    What file format should I send for a PTFE parts quote?<\/h3>\n

    A dimensioned 2D PDF plus a STEP or IGES 3D file. The PDF is the contractual reference; the 3D file lets the supplier assess machinability.<\/p>\n

    What tolerances can PTFE machined parts hold?<\/h3>\n

    General features routinely hold \u00b10.1 mm; critical functional dimensions hold \u00b10.05 mm with SPC process control. Blanket ultra-tight tolerances raise cost sharply.<\/p>\n

    Why do suppliers ask for service temperature and media?<\/h3>\n

    PTFE grade selection depends on the environment \u2014 filled grades interact with some media, and creep behavior changes with temperature. Early disclosure prevents wrong-grade first articles.<\/p>\n

    Should I include annual volume in a custom PTFE RFQ?<\/h3>\n

    Yes. Volume determines fixturing and batching strategy, which materially changes unit price and lead time.<\/p>\n