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CNC Milling Parts 420j2 Stainless Steel Precision

CNC lathe milling
February 02, 2026
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Brief: Join a quick walkthrough that focuses on what matters to users and operators. This video demonstrates the precision manufacturing process of 420J2 stainless steel long axis CNC milling parts with side holes and threads. You'll see how advanced multi-axis CNC milling ensures strict concentricity and positional accuracy for high-load applications in industrial, automotive, and machinery systems.
Related Product Features:
  • Made from martensitic 420J2 stainless steel, heat treated to 50-55 HRC for excellent hardness and wear resistance.
  • Features a long shaft geometry with precisely located side holes for lubrication, pinning, or sensing applications.
  • Includes accurately machined threads for mounting or adjustment, produced via precision thread milling.
  • Manufactured using advanced multi-axis CNC milling for strict concentricity and positional accuracy.
  • Suitable for high-load, high-cycle applications in industrial hydraulic systems, automotive gearboxes, and printing machinery.
  • Available in shaft diameters from 5mm to 80mm and lengths up to 1500mm with high aspect ratios.
  • Offers dimensional precision with shaft diameter tolerances of ±0.02mm and side hole positional tolerance of ±0.05mm.
  • Undergoes comprehensive quality assurance including CMM inspection, hardness testing, and material certification.
FAQs:
  • What are the key advantages of using 420J2 stainless steel for these CNC milling parts?
    420J2 stainless steel offers excellent hardness and wear resistance after heat treatment (typically 50-55 HRC), good corrosion resistance for industrial environments, and high tensile strength (1600-1900 MPa), making it ideal for demanding power transmission and actuation systems.
  • What types of applications are these long axis parts with side holes and threads suitable for?
    These components are designed for industrial hydraulic and pneumatic cylinders as piston rods, automotive gearbox and actuator shafts, printing machinery drive shafts, textile equipment rollers, and valve stems in pump manufacturing where threads and side holes are needed for mounting, lubrication, or sensing.
  • How does the CNC milling process ensure precision for these long shaft components?
    The process involves multi-axis CNC milling with the shaft mounted between live centers for rigidity, precision thread milling for accurate threads, and post-heat treatment grinding to maintain tight tolerances. This ensures concentricity within 0.02mm TIR and side hole positional accuracy of ±0.05mm.
  • What quality assurance measures are implemented during manufacturing?
    Each component undergoes 100% dimensional inspection using CMM and optical comparators, hardness testing to verify 50-55 HRC, material certification per EN 10204 3.1, and first article inspection with full dimensional reports to ensure compliance with specifications.
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