S-92210A599 5/16"-18 x 4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel and passivated finish for long-term reliability in harsh environments
• Superior load-bearing capability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise thread engagement through Class 3A thread fit ensuring secure fastening and vibration resistance
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Efficient installation and removal using hex drive design for high-torque applications without cam-out issues
• Full-length threading provides consistent holding power along the entire 4" length for maximum grip
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)

Professional Applications & Engineering Value

These 5/16"-18 UNC flat head screws deliver critical performance in industrial settings where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel construction combined with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine, chemical processing, and outdoor applications. The Class 3A thread fit ensures precise mating with corresponding nuts and tapped holes, eliminating play and maintaining joint integrity under vibration and dynamic loads. The hex drive system allows for high torque application in confined spaces, while the 82° countersink angle creates seamless flush mounting in machinery, equipment frames, and structural assemblies where protrusions are unacceptable.

Specification Summary & Compliance

This flat head hex drive screw features UNC coarse threads with Class 3A thread fit precision, measuring 5/16"-18 thread size with 4" fully threaded length. Manufactured to ASME B18.3 specifications for dimensional accuracy and performance reliability. The product demonstrates full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility in industrial supply chains.