Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of din933 carbon steel grade 4.8 with black plated hex bolt full thread in China. Welcome to buy bulk high quality din933 carbon steel grade 4.8 with black plated hex bolt full thread 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 4.8 with a black plated finish, offering reliable strength and a professional appearance. One of our factory's best-selling and most advantageous products.It features full thread for enhanced clamping performance.
Standard dimensions follow DIN933 specifications, with custom sizes available to meet specific application requirements.The application scenarios are quite extensive.
| Parameter | Description |
| Product Name | DIN933 Hex Bolt |
| Standard | DIN933 / ISO4017 |
| Material | Carbon Steel |
| Grade | 4.8 |
| Thread Type | Full Thread |
| Head Type | Hex Head |
| Surface Treatment | Black Oxide / Black Phosphated |
| Size | M3-M30 |
| Length | 6mm-200mm |
| Thread | Metric Coarse Thread |
| Production Standard | DIN Standard |
| Place of Origin | Handan, Hebei, China |
| Packaging | Carton + Pallet / Customized |
| OEM Service | Available |
Manufacturing Process
Wire Drawing
Raw carbon steel wire is drawn to precise diameter, ensuring dimensional consistency.
Cold Heading
Wire is cut and formed into bolt blanks with hex head shape under high pressure, enhancing material strength.
Thread Rolling
Threads are rolled onto the blank, producing accurate, fatigue-resistant threads without material loss.
Black Plating
Surface is coated with black oxide finish for corrosion resistance and uniform appearance.
Inspection & Packaging
Each batch is inspected for dimensions, thread quality, and coating integrity before packaging.
Quality Control & Facility Advantage
We operate under a strict quality management system, conducting tensile strength tests, hardness checks, and salt spray testing to verify coating performance. Our facility spans over 8,000 square meters with substantial warehousing capacity, located in a leading fastener industry cluster, which enables fast access to raw materials, efficient logistics, and close coordination with supporting suppliers.
Supply Chain Strength
As a factory specializing in bolt production, we benefit from a fully integrated supply chain. This vertical structure allows us to maintain cost stability and offer competitive pricing without compromising quality. Our monthly shipment and order volume consistently exceed 500 tons, reflecting strong production capacity and reliable delivery performance.
Custom Packaging & After-Sales Service
We provide custom packaging solutions, including private labeling, branded cartons, and palletized bulk packaging tailored to customer requirements. 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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