S-91253A030 0-80 x 3/16" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Superior thread engagement and vibration resistance from the Class 3A fine UNF thread, ensuring reliable, long-term fastening integrity.
• High tensile strength of 130,000 psi provides robust clamping force and resistance to mechanical failure under heavy loads.
• Optimized flush mounting with an 82° countersink angle and flat head design for a clean, secure fit in precision assemblies.
• Easy and secure installation using a standard hex drive, minimizing the risk of tool slippage and head stripping.
• Full compliance with ASTM F835 and environmental regulations (RoHS 3, REACH), guaranteeing material quality and safety for global supply chains.
• Alloy steel construction with Rockwell C39 hardness offers an excellent balance of strength and durability for repeated use.

Professional Applications & Engineering Value

This 0-80 UNF flat head screw is engineered to solve critical challenges in precision engineering and industrial assembly. The black-oxide alloy steel material provides a protective barrier against rust and wear, essential for components in electronics, aerospace, and machinery exposed to harsh conditions. The Class 3A fine thread ensures a tight, precise fit in tapped holes, significantly reducing the risk of loosening from vibration—a common failure point in dynamic systems. The fully threaded design and 82° countersink angle allow for a flush, low-profile installation, making it ideal for applications where space is limited and a smooth surface finish is required. By meeting ASTM F835 standards, this screw delivers consistent performance and reliability, streamlining procurement for B2B buyers who demand compliance and traceability.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for high precision in Unified National Fine (UNF) threading. Manufacturing and material specifications conform to ASTM F835, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in industrial and electronic applications worldwide.