S-93516A117 1/4"-20 x 3 1/2" ASME B18.2.1 Bronze Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance for long-lasting performance in marine and harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and structural integrity
• Rockwell B70 hardness provides excellent durability and resistance to wear and deformation
• Fully threaded UNC coarse pattern delivers faster installation and superior holding power
• External hex drive design allows for easy installation with standard tools and high torque application
• Class 2A thread fit guarantees precise, consistent threading for secure fastening
• Compliance with major industry standards including ASME B18.2.1, RoHS 3, and REACH regulations

Professional Applications & Engineering Value

These 651 Silicon Bronze hex head screws are engineered specifically for demanding applications where corrosion resistance and mechanical strength are critical. The marine-grade silicon bronze composition provides exceptional protection against saltwater corrosion, making them ideal for marine hardware, coastal structures, and chemical processing equipment. The UNC coarse thread pattern ensures reliable performance in soft materials and applications requiring frequent disassembly, while the external hex drive facilitates high-torque installation without stripping. With full threading along the 3-1/2" length, these screws offer maximum engagement and holding power in structural connections, electrical enclosures, and industrial machinery exposed to harsh environments. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these fasteners maintain integrity under vibration and load stress.

Specification Summary & Compliance

This 1/4"-20 x 3-1/2" hex head screw features UNC coarse threads with Class 2A thread fit for standard industrial applications. Manufactured to ASME B18.2.1 specifications for dimensional accuracy and mechanical properties. The product is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for hazardous substances. Thread direction is right-hand with fully threaded design for maximum fastening efficiency.