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Steel Capillary Variable Diameter Head Expansion

Medical Machining Parts
January 29, 2026
Category Connection: Medical Machining Parts
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Tags:
#Medical Needle #CNC Milling Parts #Cnc Medical Parts
Brief: Ever wondered how precision capillary tubing is transformed into complex micro-fluidic components? This video provides a detailed walkthrough of the complete fabrication process for 316L stainless steel capillary tubing with variable diameter head expansion and contraction. You'll see demonstrations of precision swaging, end forming, sandblasting, and laser marking techniques that create components for medical, analytical, and high-purity applications.
Related Product Features:
  • Precision diameter transitions through swaging and expanding techniques for controlled flow and connection interfaces.
  • Hermetic end sealing via cold forming or welding methods to contain pressure in critical applications.
  • Uniform matte surface finish achieved through high-purity sandblasting for optimal cleanliness and marking adhesion.
  • Permanent laser marking that withstands sterilization cycles and provides essential traceability.
  • Full chemical passivation per ASTM A967 standards to maximize corrosion resistance of 316L stainless steel.
  • Stress relief annealing after cold working to maintain material ductility and prevent stress corrosion cracking.
  • Comprehensive quality assurance including dimensional inspection, leak testing, and full documentation packages.
  • Biocompatible 316L material suitable for medical devices, semiconductor, and pharmaceutical applications.
FAQs:
  • What materials and certifications are used for these capillary components?
    We use 316L stainless steel (UNS S31603) certified to ASTM A269 standards with full Mill Test Reports per EN 10204 3.1, ensuring optimal corrosion resistance and material traceability.
  • How are the diameter changes and end forms created on the capillary tubing?
    Precision diameter transitions are achieved through rotary swaging for reductions and mandrel expansion for flares, while ends are sealed via cold forming or laser/TIG welding, all followed by stress relief annealing to maintain material integrity.
  • What surface treatments and marking methods are applied to ensure durability and traceability?
    Components undergo sandblasting with high-purity media for a uniform matte finish, chemical passivation per ASTM A967, and permanent fiber laser marking that resists solvents and sterilization cycles while providing clear identification.
  • What quality control measures and documentation are provided with these components?
    We perform 100% dimensional inspection, visual quality control, optional leak testing, and provide comprehensive documentation including Certificates of Conformity, dimensional reports, material certifications, and passivation reports.
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