S-98164A246 1/4"-20 x 3" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
• Precision thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance in critical assemblies
• Optimized drive efficiency through 5/32" hex drive design providing superior torque transmission and reduced cam-out risk
• Full-threaded design delivering maximum grip length and uniform stress distribution across the entire fastener length
• Regulatory compliance assurance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant for global applications
• Coarse UNC threading enabling faster installation and reduced cross-threading incidents in industrial assembly operations

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel rounded head screws provide critical corrosion resistance where exposure to chemicals, saltwater, or extreme weather conditions would compromise ordinary fasteners. The combination of Class 3A thread fit and coarse UNC threading ensures rapid installation with minimal risk of cross-threading, while the fully threaded design maintains consistent clamping force across the entire engagement length. The hex drive configuration delivers superior torque transmission for high-tension applications in machinery, structural frameworks, and processing equipment. These ASME B18.3 compliant fasteners are particularly valuable in chemical processing, marine hardware, food processing equipment, and offshore installations where regulatory compliance and material integrity are non-negotiable.

Specification Summary & Compliance

This 1/4"-20 x 3" rounded head screw features precision UNC coarse threads with Class 3A thread fit tolerance for superior engagement. Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener maintains dimensional accuracy with 0.25" thread diameter, 0.437" head diameter, and right-hand thread direction consistent with industrial standards for interchangeable use across compliant assemblies.