S-91263A199 3/8"-16 x 5" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit offers precise, tight-tolerance threading for secure, vibration-resistant connections.
• Partially threaded design allows for controlled clamping force and easier alignment in assembly operations.
• 82° countersink angle with standard flat head profile enables a flush, professional finish that minimizes snagging and improves safety.
• Hex drive (7/32") facilitates high-torque installation with common tools, speeding up assembly and reducing labor time.
• Compliance with ASME B18.3, RoHS, and REACH ensures adherence to industry standards and environmental regulations, supporting responsible sourcing.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered for heavy-duty industrial applications where reliability and durability are paramount. The zinc-plated alloy steel material combats corrosion in challenging environments, while the coarse thread spacing and Class 3A fit provide excellent grip and resistance to loosening under vibration. Ideal for machinery, structural assemblies, and equipment manufacturing, its partially threaded shank allows for precise tension control, preventing joint failure. The flat head with 82° countersink ensures a smooth surface finish, reducing hazards in high-traffic areas. With a Rockwell C32 hardness and robust construction, it addresses common issues like strip-out and fatigue, making it a trusted choice for engineers seeking long-term fastening solutions.

Specification Summary & Compliance

This product features a 3/8"-16 UNC thread with Class 3A precision fit and coarse thread spacing, ensuring dimensional accuracy per ASME B18.3 specifications. It is manufactured from alloy steel with a zinc-plated finish and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming its suitability for regulated industrial and international markets.