S-97646A160 5/16"-18 x 1 1/4" 18-8 Stainless Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 Stainless Steel construction, ideal for harsh environments and long-term outdoor use.
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness, ensuring reliable performance under high-stress conditions.
• Secure, vibration-resistant locking provided by the serrated flange, preventing loosening in dynamic or high-vibration machinery.
• Efficient installation and removal with the external hex drive and coarse UNC threading, reducing assembly time and labor costs.
• Precise thread engagement with Class 2A fit, guaranteeing consistent performance and interchangeability in manufactured components.
• Enhanced load distribution from the integrated flange, minimizing surface damage and providing a larger bearing area.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries and international markets.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 18-8 Stainless Steel hex head screws combine corrosion resistance with high tensile strength to solve common failure points in machinery, construction, and marine applications. The fully threaded UNC coarse thread design ensures rapid assembly and deep clamping force, while the serrated locking flange effectively counters vibration-induced loosening—a critical advantage in automotive, HVAC, and heavy equipment. With a Class 2A thread fit, these screws maintain dimensional accuracy for repeatable use in precision assemblies, reducing the risk of cross-threading and component mismatch. The external hex drive allows for high-torque installation, making them suitable for both automated and manual fastening processes where reliability is non-negotiable.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features a Class 2A thread fit with coarse thread spacing and right-hand threading, ensuring standard-compliant dimensional accuracy. Manufactured from 18-8 Stainless Steel with a flange diameter of 11/16" and full threading over the 1-1/4" length. The product conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally sensitive and internationally regulated applications.