S-98164A427 2-56 x 3/8" 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 industrial and marine environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress
• Precise thread engagement through Class 3A fit and UNC coarse threading, ensuring secure fastening and vibration resistance
• Easy installation and removal with 0.050" hex drive and rounded button head design, reducing assembly time and tool wear
• Full threading along the 3/8" length provides maximum grip and load distribution across the entire fastener
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety
• Versatile right-hand threading with standard coarse spacing for quick assembly in various materials and applications

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws with 2-56 UNC coarse threading are engineered to address critical challenges in demanding environments. The combination of passivated finish and high-grade material provides outstanding protection against corrosion, making them ideal for marine equipment, chemical processing, and outdoor industrial applications where moisture and chemicals are prevalent. The Class 3A thread fit ensures tight tolerances and reliable performance in high-vibration settings, reducing the risk of loosening over time. With a 0.050" hex drive and rounded button head profile, installation is streamlined, minimizing stripping and improving torque application. These screws deliver consistent tensile strength and durability, supporting structural integrity in assemblies requiring precise fastening and long-term reliability.

Specification Summary & Compliance

These screws feature 2-56 UNC coarse threading with Class 3A fit for high precision and strength. Manufactured in compliance with ASME B18.3 standards, they ensure consistent quality and performance. The products are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use. Key dimensions include a thread diameter of 0.086", head diameter of 0.164", and length of 3/8", with full threading for optimal load distribution.