Engineered for heavy-duty fastening in British imperial standard applications, our 10.9 Grade Black BSW Countersunk Head Hex Screw delivers exceptional tensile strength, corrosion resistance, and flush-installation performance. Available in dual sizes (5/16-18 & 3/8-16 BSW), this black-finished hex screw adheres to strict British Standard Whitworth specifications, making it ideal for industrial machinery, construction hardware, and legacy equipment maintenance that requires reliable BSW fasteners.
Core Features & Benefits
10.9 Grade High-Strength Alloy Steel: Crafted from premium 10.9 grade alloy steel, one of the highest strength ratings for industrial fasteners. It offers outstanding tensile and shear resistance, capable of withstanding heavy loads and high-stress working conditions without deformation or fatigue.
Black Oxide Corrosion Protection: Features a durable black oxide finish that enhances wear resistance and provides a basic level of corrosion protection. The sleek black coating also improves aesthetics and reduces light reflection, suitable for applications where appearance and rust resistance are required.
Dual BSW Sizes (5/16-18 & 3/8-16): Covers two commonly used British Standard Whitworth inch thread sizes in one listing. The precise thread machining ensures seamless compatibility with BSW nuts and taps, meeting the diverse needs of industrial assembly and equipment repair.
Countersunk Head Flush Design: The countersunk head structure enables the screw to sit completely flush with the workpiece surface after installation. It eliminates protrusions, prevents interference with moving parts, and maintains a neat, streamlined finish for both functional and aesthetic purposes.
Hex Drive for Secure Tightening: Equipped with a standard hex (Allen key) drive that ensures stable torque transfer during installation. It minimizes slippage and head damage, allowing for precise and efficient tightening even in narrow or confined spaces.
Specifications
Material: 10.9 Grade High-Strength Alloy Steel
Finish: Black Oxide Coating
Thread Standard: 5/16-18 & 3/8-16 BSW (British Standard Whitworth)
Head Type: Countersunk Head
Drive Type: Hex (Allen)
Application: Industrial Machinery, Construction Hardware, Legacy Equipment Maintenance, BSW Standard Assemblies
