S-90429A139 7/16"-20 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and vibration
• Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
• Partially threaded design allows for optimal clamping force distribution and secure fastening in critical applications
• 82° countersink angle enables flush mounting for clean, professional finishes in precision assemblies
• Hex drive compatibility with 1/4" drive tools ensures easy installation and removal with standard industrial equipment
• Full regulatory compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global market acceptance

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws deliver exceptional engineering value in demanding applications where corrosion resistance and high tensile strength are critical. The 7/16"-20 UNF fine thread configuration provides superior holding power in materials prone to stripping, while the Class 3A thread fit ensures precise engagement in high-vibration environments. The partially threaded design concentrates clamping force exactly where needed, preventing joint loosening in machinery, heavy equipment, and structural assemblies. The 82° countersink angle and flat head profile create seamless surfaces in precision manufacturing applications, making these industrial fasteners ideal for aerospace components, automotive systems, and heavy machinery where reliability and regulatory compliance are non-negotiable.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit precision and UNF fine thread specifications. These flat head screws comply with ASME B18.3 dimensional requirements and ASTM F835 mechanical properties. The black-oxide alloy steel construction delivers Rockwell C39 hardness and 130,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial use.