Heavy Duty Hex Head Wood Screws Black Finish

Heavy Duty Hex Head Wood Screws Black Finish is a high-strength structural fastener designed for solid wood load-bearing connection. Made of standard medium carbon steel, it features a stable tensile strength above 450MPa, complying with international construction fastener standards. The black oxide surface forms a 3–8μm dense protective layer to resist oxidation in dry and indoor environments. The product covers complete size ranges from 25mm to 200mm to meet various wooden structure assembly needs. Ningbo Gangtong Zheli Fasteners Co., Ltd. insists on strict raw material inspection to ensure stable and reliable product performance.

Structural Performance and Processing Technology

Heavy Duty Hex Head Wood Screws Black Finish adopts advanced cold rolling thread forming technology for neat thread teeth and high bite accuracy. The self-drilling tip is high-frequency quenched, reaching HRC 32–38 hardness, allowing fast penetration into hardwood without pre-drilling. The standard hex head fits universal wrenches and electric installation tools for labor-saving construction. With standardized production procedures, the factory maintains a product qualification rate above 99.2% for consistent batch quality in engineering projects.

Application Scope and Surface Options

Suitable for terrace building, fence installation, wood frame reinforcement and indoor solid wood fixing, Heavy Duty Hex Head Wood Screws Black Finish provides strong clamping force and excellent anti-loosening performance under long-term load. Its deep coarse thread design greatly increases contact area with wood fiber, effectively preventing slipping and loosening. Electro-galvanized and stainless steel surface versions are available for outdoor, humid and corrosive working environments.

Quality Control and Supply Advantage

Heavy Duty Hex Head Wood Screws Black Finish undergoes strict multi-process inspection to maintain stable mechanical performance in medium and heavy wooden construction projects. All raw materials are purchased from certified steel mills with complete test reports. The whole production process includes cutting, heading, thread rolling and heat treatment to eliminate defective products. Professional testing shows different sizes can bear vertical tension of 1.2kN to 7.5kN, fully adapting to household decoration and medium construction projects. Ningbo Gangtong Zheli Fasteners Co., Ltd. supports non-standard customization and stable long-term bulk supply for global buyers.