S-94444A113 5/16"-18 x 2" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coated 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness to withstand high-stress applications
• Reliable fastening performance through UNC coarse threading and Class 2A thread fit ensuring secure connections with minimal cross-threading risk
• Optimized installation efficiency with external hex drive and standard 1/2" head width for easy tool access and high torque application
• Versatile partial threading design combining 7/8" minimum threaded section with smooth shank for precise clamping control
• Industry-standard compliance meeting ASME B18.2.1 specifications for consistent quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use across global industrial markets

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel hex head screws deliver critical engineering advantages for industrial assembly and machinery applications. The combination of 80,000 psi tensile strength and Rockwell B70 hardness provides exceptional load-bearing capacity while resisting deformation under stress. The UNC coarse thread configuration with Class 2A thread fit ensures rapid installation in various materials while maintaining vibration resistance. The black-oxide surface treatment enhances corrosion protection beyond standard stainless steel, making these hex head fasteners ideal for outdoor equipment, marine components, and industrial machinery exposed to moisture, chemicals, or temperature variations. The partially threaded design allows for precise clamping force distribution, preventing joint loosening in dynamic load conditions common in automotive, construction, and manufacturing applications.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance for consistent performance. Thread specifications include 5/16"-18 UNC coarse spacing with right-hand orientation and 0.3125" diameter. Complies with ASME B18.2.1 mechanical and dimensional requirements for hex head screws. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring restriction of hazardous substances for global industrial use.