Machined

SURFACE FINISHES

Ten Common Surface Finishes for Machined Parts

  • AS-MACHINED Standard Process
    01
    AS-MACHINED STANDARD PROCESS

    Fastest lead time; parts retain visible tool marks and inherent burrs/sharp edges (burrs removed upon request); surface roughness Ra 125 μin; no additional surface finishing costs.

  • SANDBLASTING
    02
    SANDBLASTING

    Creates a uniform matte texture across the entire surface; removes tool marks and surface imperfections to enhance aesthetic appeal.

  • TUMBLE FINISHING
    03
    TUMBLE FINISHING

    Batch-processing method for vibratory deburring and removing tool marks; ideal for mass production of small parts; parts with an outer diameter > 8 inches require manual dimensional inspection after finishing.

  • ALUMINUM ANODIZING Type II / Type III Hard
    04
    ALUMINUM ANODIZING TYPE II / TYPE III HARD

    Type II creates a thin, corrosion-resistant layer available in clear, black, red, and gold colors; Type III (Hard Anodizing) produces a thicker oxide layer offering superior corrosion resistance and wear resistance (applicable only to aluminum alloys).

  • CHROMATE CONVERSION COATING MIL-DTL-5541
    05
    CHROMATE CONVERSION COATING MIL-DTL-5541

    Forms a thin film (0.00001–0.00004 in) with a golden-yellow or light-yellow hue; provides excellent corrosion resistance and electrical conductivity; commonly used as a primer for painting.

  • STAINLESS STEEL PASSIVATION
    06
    STAINLESS STEEL PASSIVATION

    Suitable for 200-series, 300-series, and precipitation-hardening stainless steels; creates an extremely thin oxide layer (approx. 0.0000001 in) that enhances the material's corrosion resistance without altering the part's dimensions.

  • POWDER COATING
    07
    POWDER COATING

    Dry powder is applied via electrostatic spraying and then cured at high temperatures; the resulting paint film is tough, wear-resistant, and corrosion-resistant; available in a wide range of colors with superior adhesion compared to conventional liquid painting.

  • ELECTROPOLISHING
    08
    ELECTROPOLISHING

    An electrochemical brightening treatment for stainless steel; removes 0.0001–0.0025 in of base material to achieve a mirror-like finish and reduce potential corrosion risks.

  • TUMBLE FINISHING
    09
    TUMBLE FINISHING

    A non-electrolytic plating process that ensures uniform coating thickness—even on parts with complex geometries; features a bright finish with a standard initial thickness of 0.0001 in; offers excellent corrosion and wear resistance.

  • HOT-DIP / ELECTRO-GALVANIZING ASTM B633-15
    10
    HOT-DIP / ELECTRO-GALVANIZING ASTM B633-15

    Provides complete zinc coverage on steel components, ensuring a uniform coating even on complex structures; primarily designed to deliver long-term rust prevention and protection for carbon steel.