S-98164A434 4-40 x 3/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 316 stainless steel and passivated finish, ideal for harsh chemical and marine environments
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Class 3A thread fit provides superior precision and consistent engagement in demanding assemblies
• Rockwell B55 hardness offers excellent durability and resistance to wear over extended use
• Hex drive design with 1/16" drive size allows for secure tool engagement and efficient installation
• Full threading along the 3/4" length enables maximum grip and adjustability in various material thicknesses
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC screws in 316 stainless steel deliver unmatched corrosion resistance, making them ideal for chemical processing, marine equipment, and outdoor installations. The passivated finish enhances surface durability, while the coarse thread spacing and Class 3A thread fit ensure quick, secure fastening in high-vibration environments. With a rounded head style and hex drive, they provide easy installation and a clean aesthetic, reducing assembly time and maintenance costs in heavy-duty fastening scenarios where reliability is critical.

Specification Summary & Compliance

This rounded head screw features precise UNC thread with Class 3A fit, coarse thread spacing, and dimensions including a 0.213" head diameter and 3/4" length. It meets ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard quality for professional use.