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China, Chinese Durable Black-Plated Self-Tapping Screws with Unique Underhead Relief1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Fastener FittingSelf tapping ScrewsBlack-PlatedSelf-Tapping Screw with Underhead Relief
Hebei Lingke Metal Products Co., Ltd
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Product Descriptionblack-plated self-tapping screw with underhead reliefProduct Definition & Core FunctionalityMaterial & Surface Treatment OptionsTypical Application FieldsThis fastener is a self-tapping screw featuring two key designs: a black-plated finish and an underhead relief groove. Its self-tapping thread (ISO 1478 or ASME B18.6.3 compliant) allows direct threading in metal sheets or plastic substrates without pre-drilling. The black plating boosts rust resistance and enhances visual appeal, while the undercut groove aids in tool withdrawal during manufacturing, preventing thread damage and ensuring smooth assembly.Typical base materials include high-strength carbon steel (e.g., 4.8/8.8 grade) for general use and stainless steel (304/316) for corrosive environments. The black finish generally employs either black zinc plating (ASTM B633, ≥48-hour salt spray resistance) or black oxide coating (GB/T 15519, cost-effective for indoor use). All treatments comply with RoHS, avoiding harmful substances like hexavalent chromium.Widely used in electronics (e.g., miniature screws for circuit boards with aesthetic black plating), furniture manufacturing (for connecting wood/plastic panels with rust resistance for indoor humidity), automotive interiors (high-strength carbon steel for dashboards), and construction (stainless steel 316 for outdoor curtain walls, resisting atmospheric corrosion).ItemDetailsStructural Compositionblack-plated self-tapping screw with underhead reliefstandardGB/T 3-1997Surface Treatmentblack-platedPacking & DeliveryBag PackagingCarton PackagingFasteners are packaged in durable plastic bags, available in various sizes for different quantities (e.g., small batches of screws, nuts, or bolts). The bags, sealed by heat or zipper, prevent moisture, dust, and loss. This method is lightweight, cost-effective, and suitable for retail sales, small shipments, or situations needing easy access to fasteners. Clear plastic bags allow quick visual identification of the contents.For larger quantities or bulk transport, cartons are used. These sturdy cardboard boxes, often with corrugated layers, protect against impacts during handling and shipping. Fasteners in cartons are usually pre-packed in bags or separated by dividers to avoid friction and damage. Cartons can be labeled with product details (e.g., type, size, quantity) and are stackable, optimizing storage and logistics efficiency. Ideal for industrial orders, wholesale distribution, or long-distance transport where durability is key.Company ProfileCompany Name Hebei LING KE Metal Products Manufacturing Co. is a leading force in the fastener industry, with over a decade of excellence. The company is dedicated to providing high-quality fasteners and comprehensive fastening solutions to a diverse range of industries worldwide. In recent decades, Hebei LING KE has expanded globally, establishing strategic partnerships and distribution centers worldwide, allowing better service to its international customer base and meeting growing demand in emerging markets.
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