S-90044A434 1/2"-13 x 2 5/8" ASME B18.3, ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 170,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance thanks to black-oxide coating on alloy steel, extending service life in demanding environments
• Precise thread engagement with Class 3A fit and coarse UNRC threads ensuring secure fastening and vibration resistance
• Optimized drive efficiency through 3/8" hex socket design providing maximum torque transmission and strip-resistant installation
• Enhanced mechanical durability with Rockwell C37 hardness maintaining structural integrity under repeated loads
• Versatile partial threading allowing both threaded engagement and smooth shank functionality in complex assemblies
• Broad industrial compatibility meeting ASME B18.3 and ASTM A574 specifications for quality assurance across applications

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws solve critical fastening challenges in heavy machinery, automotive assemblies, and structural frameworks. The coarse UNRC thread configuration combined with Class 3A thread fit ensures rapid installation and superior vibration resistance, eliminating loosening in dynamic environments. The partially threaded design provides dual functionality - secure threaded engagement where needed while allowing precision alignment through the smooth shank section. With 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners maintain clamping force under extreme loads, preventing joint failure in critical connections. The black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy, making them ideal for both indoor and outdoor industrial settings where environmental factors threaten fastener integrity.

Specification Summary & Compliance

These socket head cap screws feature precision 1/2"-13 UNRC coarse threads with Class 3A fit for superior thread engagement and dimensional accuracy. Manufacturing complies with ASME B18.3 specifications and material meets ASTM A574 standards for consistent quality. The fasteners are fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, ensuring environmental responsibility and regulatory adherence for global industrial applications.