S-98164A516 1/4"-20 x 1/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated surface treatment
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise thread engagement ensured by Class 3A thread fit and UNC coarse threading for vibration resistance and easy assembly
• Optimized drive efficiency with 5/32" hex drive design providing secure tool engagement and reduced stripping risk
• Enhanced durability through fully threaded design and rounded button head profile distributing stress evenly
• Regulatory compliance meeting ASME B18.3, ASTM F879, RoHS 3, and REACH standards for quality assurance
• Versatile industrial application with 1/4"-20 thread size accommodating various assembly requirements

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel rounded head screws deliver critical corrosion resistance where exposure to chemicals, moisture, or extreme temperatures would compromise ordinary fasteners. The passivated finish creates an additional protective oxide layer, significantly extending service life in marine, chemical processing, and food industry applications. The UNC coarse threading combined with Class 3A thread fit ensures rapid installation and maintains clamping force under vibration, while the hex drive design provides superior torque transmission compared to Phillips or slotted alternatives. These fully threaded button head screws offer a low-profile solution where clearance is limited, making them ideal for machinery, enclosures, and structural assemblies requiring both aesthetic appeal and mechanical reliability.

Specification Summary & Compliance

This industrial-grade fastener features precise 1/4"-20 UNC coarse threads with Class 3A thread fit tolerance for superior engagement. Manufacturing complies with ASME B18.3 specifications and ASTM F879 standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for global industrial applications.