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Material Selection
High-quality steel bars or wire rods (e.g., aço carbono, alloy steel, or stainless steel) are selected based on mechanical strength, corrosion resistance, and application requirements. -
Cutting / Blanking
The raw material is cut into appropriate lengths or blanks using sawing or automatic feeding and cutting machines. -
Cold or Hot Forging
The basic nut shape is formed using cold forging (for smaller nuts) or hot forging (for larger or special shapes), which enhances structural strength. -
Trimming & Chamfering
The forged nut is trimmed to remove excess material, and chamfering is done to smooth the edges for easier assembly. -
Thread Tapping
Internal threads are created using tapping machines. Thread tolerance and pitch must meet international standards (such as ISO, DIN, or ANSI). -
Heat Treatment (if required)
Nuts may undergo quenching and tempering to increase hardness, tensile strength, and wear resistance. -
Surface Treatment
Various coatings are applied to improve corrosion resistance and appearance:-
Zinc plating (blue/white/yellow)
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Black oxide
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Phosphate coating
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Dacromet or Geomet
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Galvanization or nickel plating (for stainless/anti-corrosive requirements)
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Inspection and Quality Control
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Dimensional checks using thread gauges and micrometers
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Hardness and torque testing
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Salt spray testing (for coated nuts)
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Visual inspection and sorting (automated if required)
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Packaging
Nuts are cleaned, sorted, and packed in bulk, small boxes, or custom packaging with full product traceability and labeling.
