S-91781A619 3/8"-16 x 1/2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and extended service life
• Superior mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under high stress
• Optimized flush mounting featuring an 82° countersink angle and undercut flat head profile for a secure, non-protruding fit
• Wide compatibility and easy installation with UNC coarse threads, Class 2A fit, and slotted drive for standard tool use
• Full thread engagement along the entire 1/2" length for maximum grip and load distribution in assemblies
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe, quality industrial use

Professional Applications & Engineering Value

This 3/8"-16 UNC Flat Head Screw is engineered to address critical challenges in industrial assembly, where corrosion resistance, structural integrity, and precise fit are paramount. The 18-8 Stainless Steel material, enhanced by a passivated finish, provides long-term durability against moisture, chemicals, and oxidation, reducing maintenance needs in machinery, marine, and outdoor equipment. Its fully threaded coarse UNC design ensures rapid installation and robust holding power, while the 82° countersink angle and undercut head prevent surface damage and allow for seamless integration in countersunk holes. Ideal for heavy-duty applications like automotive frames, construction fixtures, and electrical enclosures, this screw delivers consistent performance under 80,000 psi tensile loads, minimizing the risk of fastener failure and enhancing overall assembly reliability.

Specification Summary & Compliance

This flat head screw adheres to precise dimensional standards, including Class 2A thread fit for consistent assembly tolerance and UNC coarse threading (3/8"-16) for efficient engagement. Manufacturing and quality are governed by ASME B18.6.3 specifications, ensuring uniformity and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmentally responsible sourcing for global industrial supply chains.