S-92210A547 1/4"-20 x 1 5/8" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness to withstand high-stress applications
• Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
• Efficient hex drive installation with 5/32" drive size providing secure tool engagement and reduced cam-out risk
• Optimal flush mounting with standard 82° countersink angle for seamless surface integration in machined components
• Full threading design delivers maximum grip length and uniform load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3, ASTM F879, RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC flat head screws solve critical fastening challenges through their 18-8 stainless steel composition and passivated finish. The combination delivers exceptional corrosion resistance where exposure to moisture, chemicals, or outdoor elements would compromise ordinary fasteners. The hex drive design with 5/32" drive size prevents stripping during high-torque installation in production lines, while the Class 3A thread fit maintains precise tolerances for vibration-prone machinery. The fully threaded configuration and 82° countersink angle make these screws ideal for aerospace components, marine hardware, and precision equipment where flush mounting and maximum clamping force are essential. Their 70,000 psi tensile strength ensures structural integrity in heavy-duty assemblies, reducing maintenance frequency and downtime.

Specification Summary & Compliance

Manufactured to exacting standards, these screws feature 1/4"-20 UNC coarse threads with Class 3A fit for superior dimensional accuracy. The manufacturing process adheres to ASME B18.3 specifications and ASTM F879 standards, ensuring consistent quality and performance. Regulatory compliance includes full conformance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, making them suitable for international industrial markets and environmentally conscious manufacturing operations.