S-90429A138 7/16"-20 x 2 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress applications, minimizing failure risks
• Class 3A thread fit precision provides superior engagement and vibration resistance in demanding assemblies
• Black-oxide alloy steel construction offers enhanced corrosion resistance for extended service life in harsh environments
• Partially threaded UNF fine spacing delivers optimal clamping force distribution and prevents loosening under dynamic loads
• 82° countersink angle design enables flush mounting for streamlined surfaces and improved aerodynamics
• 1/4" hex drive compatibility allows for high-torque installation with standard industrial tools
• Rockwell C39 hardness rating maintains thread integrity and drive durability through repeated use

Professional Applications & Engineering Value

These 7/16"-20 UNF flat head socket screws solve critical engineering challenges in precision machinery, automotive systems, and heavy equipment assembly. The black-oxide alloy steel construction combined with Class 3A thread fit addresses vibration-induced loosening in high-cycle applications, while the partially threaded design concentrates clamping force where needed most. The 82° countersink angle and flat head profile create seamless interfaces in precision tooling and aerospace components, eliminating protrusions that could compromise performance. With fine thread spacing and right-hand threading, these screws provide superior tension control in critical joints where reliability is non-negotiable.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNF thread form and 7/16"-20 thread size. Complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features Rockwell C39 hardness and 130,000 psi tensile strength verification for quality assurance in industrial applications.