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Secondary Process / Plating  


ZāGO offers numerous platings the choice of which depends upon the screw material you are seeking to coat:

    Black Chrome is a hard, non-reflective coating which is resistant to abrasion, heat and erosion.  The Black Chrome surface is a dull, dark grey and may be waxed or oiled to darken surface.
    Thickness:  As specified by drawing.

    Black oxide is a uniform black coating for ferrous metals.  Generally it is considered a decorative coating and provides only very limited corrosion protections under mild corrosion conditions.  Black oxide coatings should normally be given a supplementary treatment.   Black Oxide is appropriate for moving parts which can not tolerate the dimensional change of a more corrosion-resistant finish.  It can also be used to decrease light reflection.
    Thickness:  No dimensional change

  • CADMIUM (QQ-P-416C)
    Type I   = No supplementary treatment
    Type II  = Supplementary chromate treatment
    Type III = Supplementary Phosphate Treatment
    Cadmium is a bright silvery white plating.  Supplementary treatments for Type II can be golden, iridescent, amber, black or olive drab.  Corrosion resistance is very good, especially with Type II finish.  Type II is specified to show no surface corrosion products after 96 hours (20%) salt spray exposure.  Parts with hardness greater than re-40 are stress-relieved before cleaning and plating.  Parts subject to flexure, over RG-40 hardness are given a 375° & 25° post bake.
    Type II is best for corrosion resistance and is used as a paint base.  It is excellent for plating stainless steels that are to be used in conjunction with aluminum to prevent galvanic corrosion.

    Passivation is a process designed to remove foreign metals from the surface of stainless and corrosion resistant steels.  Passivation does not change the appearance of the base metal but it does purify the surface and therefore improves corrosion resistance.
    Six types of passivation are available:
    Type I        Low temperature (70°–90°, 30 minutes)
    Type II       Medium temperature (120°-130°, 20 minutes)
    Type III      High temperature (145°-155°, 10 minutes)
    Type IV     For steels containing large amounts (³0.15%) of sulfur or selenium
    Type V      Anodie-for high carbon martenaitis (?) (440 steels)
    Type VI     Low temperature (optional)

    A light coating for use as a base paint

  • GOLD (MIL-G-45204B)
    Yellow to orange color depending on proprietary process used.  Will range from matte to bright finish depending on basis metal.   Good corrosion resistance and high tarnish resistance.  Provides a lower contact resistance and is a good conductor.  Has excellent solderability.

  • NICKEL (QQ-N-290A)
    Corrosion protective plating for steel, zinc and zinc alloys as well as copper and copper alloys. 
    Nickel will be plated to specified thickness

  • ZINC (QQ-Z-325C)
    The primary use of chromate finishes on zinc is to retard or prevent formation of white corrosion products on zinc surfaces.
    Either a bright or dull finish is acceptable.  Bright zinc plating closely resembles bright chromium.  However, bright zinc does not have the permanence of surface appearance.  Zinc coated steel will not rust even when exposed to scratches because of the galvanic protection of the zinc.  On weathering, Zinc turns to a drab grey color.  Zinc should be deposited directly on the base metal.  Nickel is a permissible undercoat if base metal is a corrosion resistant steel. Parts having a hardness greater than RC-40 must be given a heat treatment prior to plating.  Springs having a hardness over RC-40 must be given an after-plating baking at 375° + 25° for 3 hours. 





Our philosophy here at ZāGO is that in today’s world the goal should not be to “arrive” but rather to constantly improve our manufacturing processes and products. We will continue to strive to find ways not just to meet our customers’ needs, but to always exceed their expectations.

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ZāGO Manufacturing Company, Inc.   973-643-6700   21 E. Runyon St - Newark, NJ 07114
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