Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of h.t grade black 8.8 bolt only metric cource din933 in China. Welcome to buy bulk high quality h.t grade black 8.8 bolt only metric cource din933 made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
The DIN933 Hex Bolt is manufactured from carbon steel Grade 8.8, offering high tensile strength and reliable performance for demanding applications.
It features full thread design for maximum clamping force and uniform load distribution. Standard dimensions comply with DIN933 specifications, while custom sizes are available to meet specific engineering requirements.
Surface treatment options include white zinc, yellow zinc, and black finish etc, providing flexibility for corrosion resistance and aesthetic preferences.
Manufacturing Process
Our production follows a precision-driven workflow:
Wire drawing to achieve exact diameter consistency
Cold heading to form the hex head and bolt blank under high pressure
Thread rolling to create accurate, fatigue-resistant threads
Heat treatment to attain Grade 8.8 mechanical properties (tensile strength ≥800 MPa)
Surface treatment – white zinc, yellow zinc, or black plating – applied uniformly for enhanced corrosion protection
Final inspection to verify dimensional accuracy, thread quality, and coating integrity
Supply Chain Strength & Global Reach
Our supply chain system is mature and vertically integrated, enabling cost stability, consistent quality, and competitive pricing. Products are exported to markets worldwide, including Europe, North America, Southeast Asia, and the Middle East, meeting diverse international quality standards.
Custom Packaging & After-Sales Service
We offer custom packaging solutions tailored to customer needs-including wholesale bulk packaging (cartons, pallets) and retail-ready packaging (blister packs, labeled boxes, small-quantity bags).
Our after-sales process ensures full traceability and rapid response: any quality-related issues are addressed within 24 hours, with replacement or credit arrangements processed promptly to minimize operational disruption.
FAQ
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