Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of high tensile grade 10.9 carbon steel yellow zinc hex bolt full thread in China. Welcome to buy bulk high quality high tensile grade 10.9 carbon steel yellow zinc hex bolt full thread made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Grade 10.9 Alloy Steel Hexagon Head Bolt / Hex Cap Screw|Trivalent Yellow Zinc Plated|Hydrogen Embrittlement Relief
Grade 10.9 Yellow Zinc Hex Bolt is designed for heavy-duty fastening applications requiring high tensile strength and moderate corrosion protection. Combining a robust alloy steel core with a decorative iridescent zinc finish, this bolt ensures both safety and visual quality.
1. High Strength: Grade 10.9
High-quality 40Cr / 35CrMo / 10B21 alloy steel.
Quenching + tempering to achieve Grade 10.9 mechanical properties.
Tensile Strength: Min. 1000 MPa (145,000 psi)
Yield Strength: Min. 900 MPa (130,500 psi)
Hardness: 32 – 39 HRC
Ideal for automotive suspension, heavy machinery, engineering structures, and wind power.
2. Surface Treatment: Yellow Iridescent Zinc (Trivalent Chromium)
Rainbow / yellow passivation layer. Provides a smooth, shiny appearance.
384 hours (no red rust).
Eco-friendly: RoHS compliant, trivalent chromium (no hexavalent chromium).
The yellow film provides a stable friction coefficient, reducing the risk of seizing during assembly.
3. Dimensional Standards
Hexagon (External hex). Allows for higher torque transmission without slipping.
Coarse thread (UNC/standard metric) or fine thread (UNF) available.
6g.
ISO 4014 (Partial thread) / ISO 4017 (Full thread) / DIN 931 / DIN 933 / GB/T 5782 & 5783.
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