S-97654A638 5/16"-18 x 1 1/4" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Precision Class 3A thread fit provides secure, tight fastening with minimal risk of loosening
• Flanged design with wide rounded head distributes clamping force evenly, reducing surface damage and improving stability
• Hex drive (3/16") allows for high-torque installation with standard tools, speeding up assembly processes
• Fully threaded coarse UNC pattern enables quick engagement and strong holding power in various materials
• Compliance with RoHS 3 and REACH standards ensures environmental safety and meets global regulatory requirements

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw is engineered to address common industrial challenges such as corrosion, high-stress fatigue, and assembly efficiency. The passivated finish enhances durability in moist or chemical-exposed settings, while the Class 3A UNC coarse thread and fully threaded design provide rapid installation and robust retention in metals, plastics, and composites. The flanged button head eliminates the need for separate washers, reducing part count and simplifying inventory. Ideal for machinery, automotive, and structural applications, this hex drive screw delivers consistent performance where reliability and compliance with RoHS and REACH are critical.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, with a diameter of 0.313" and coarse thread spacing for optimal grip. Manufactured from 18-8 stainless steel with a Rockwell B70 hardness, it ensures dimensional accuracy and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable industrial use.