S-92198A445 1/2"-20 x 4" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional load-bearing capacity with 80,000 psi tensile strength for demanding applications
• Precise thread engagement through Class 2A fit and UNF fine threading, reducing vibration loosening
• Optimized torque transmission via external hex drive and 3/4" head width for secure installation
• Enhanced durability with Rockwell B70 hardness, maintaining integrity under repeated stress
• Reliable partial threading providing unthreaded shank for improved shear strength
• Global compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This 18-8 stainless steel hex head screw delivers critical performance in industrial applications where corrosion resistance and structural integrity are paramount. The 1/2"-20 UNF fine threading ensures secure fastening in materials prone to vibration, while the partially threaded design maximizes clamp load distribution. With 80,000 psi tensile strength and Rockwell B70 hardness, it withstands heavy mechanical loads in construction, machinery assembly, and marine equipment. The external hex drive and substantial 3/4" head width provide reliable torque application, reducing installation time and preventing stripping in high-volume production environments.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 specifications with Class 2A thread fit ensuring dimensional accuracy. The 1/2"-20 UNF fine thread maintains precise tolerances while the 4" length with 1 1/4" minimum thread length provides versatile fastening options. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across global markets.