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China, Chinese Zinc-Plated Self-Tapping Screws for Easy Installation and Durability1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Fastener FittingSelf tapping ScrewsZinc-PlatedSelf-Tapping Screw with Underhead Relief
Hebei Lingke Metal Products Co., Ltd
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Product DescriptionZinc-Plated Self-Tapping Screw with Underhead ReliefElectrogalvanized Coating: Balanced Rust Protection & Dimensional PrecisionUnderhead Relief: Stress Reduction & Assembly EfficiencyApplication Scope & Performance LimitationsThese screws boast an electrogalvanized zinc layer (5–15 μm thick), applied via electrolysis to create a uniform, adhesive coating on the carbon steel substrate (typically SAE 1018–1022). This layer offers 'sacrificial anode protection,' with zinc corroding first to defend the steel beneath, achieving 24–72 hours of neutral salt spray resistance (per ASTM B117) when post-treated with trivalent chromium passivation. Crucially, the thin, smooth layer preserves thread dimensions—essential for the self-tapping function, as excessive thickness may cause thread misfit or cutting issues. The coating is RoHS compliant (restricting lead, mercury, etc.), making it ideal for consumer electronics and household appliances where environmental safety is prioritized. Unlike hot-dip galvanization, electrogalvanization removes surface roughness, ensuring compatibility with automated assembly tools (e.g., screw feeders).The unique 'underhead relief'—a narrow groove between the screw head and shank—addresses crucial self-tapping challenges:Stress concentration mitigation: The groove replaces the sharp right angle between the head and shank, lowering localized stress by 30–40% (compared to screws without relief). This prevents crack initiation under repeated vibration (e.g., appliance fans) or high torque, extending the screw's service life by 1.5–2 times.Manufacturing & assembly convenience: During thread rolling, the relief allows clearance for cutting tools, preventing tool jamming and ensuring consistent thread quality (critical for reliable self-tapping). For assembly, it accommodates slight misalignment between the screw and workpiece, reducing cross-threading risks—especially valuable in high-volume production (e.g., TV backpanel assembly) where automated tools operate rapidly.The relief's dimensions (typically 0.2–0.5 mm depth, 0.5–1.0 mm width) follow ANSI B18.6.3 or ISO 8404, ensuring compatibility with standard workpiece thicknesses (1–3 mm for metal sheets).Household appliances: Ideal for fastening metal/plastic panels on refrigerators, washing machines, and air conditioners—electrogalvanization withstands indoor humidity, while the relief prevents stress cracks in thin plastic parts.Consumer electronics: Used in TV backpanels, laptop frames, and router casings—precision threads and relief design enable automated assembly, and RoHS compliance satisfies electronics safety standards.Light industrial equipment: Employed in small power tools (e.g., drill housings) or office furniture (e.g., metal file cabinets)—the self-tapping function simplifies on-site maintenance.However, they have clear limitations:Corrosion vulnerability: The thin zinc layer is unsuitable for outdoor, salty, or acidic environments (rusts within days in rain)—consider stainless steel or hot-dip galvanized screws for such scenarios.Load constraints: Fit for low-to-medium loads (max tensile strength ~400–500 MPa); heavy structural applications (e.g., construction brackets) require high-strength alloy screws.Hard material restriction: Incapable of tapping into high-hardness steel or thick substrates—pre-drilling is necessary, negating the self-tapping benefit.ItemDetailsStructural CompositionZinc-Plated Self-Tapping Screw with Underhead ReliefstandardGB/T 3-1997Surface TreatmentZinc-PlatedPacking & DeliveryBag PackagingCarton PackagingFasteners can be packaged in robust plastic bags available in various sizes for different quantities like screws, nuts, or bolts. These bags are sealed using heat or zipper closures to prevent moisture, dust, and content loss. Lightweight and cost-effective, this packaging is perfect for retail sales, small shipments, or convenient fastener access. Clear bags offer easy visual product identification.For bulk quantities or transport, sturdy cartons are used. Made of reinforced cardboard, often with corrugated layers, they protect against impact during handling and shipping. Fasteners inside are pre-packed or separated by dividers to prevent damage. Cartons can be labeled with details like type, size, and quantity and are stackable for efficient storage and logistics. 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, marked by over a decade of excellence. Dedicated to high-quality fasteners and solutions for diverse industries globally, the company has expanded its reach with strategic partnerships and distribution centers worldwide. This expansion enhances service to international customers and meets rising product demand in emerging markets.
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