S-91251A306 3/4"-16 x 7" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 170,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by black-oxide coating on alloy steel, extending service life in demanding environments
• Precise thread engagement with Class 3A UNRF fine threads ensuring secure fastening and vibration resistance
• Optimized torque transmission through 5/8" hex drive socket head design for efficient installation and removal
• Enhanced durability with Rockwell C37 hardness maintaining structural integrity under repeated use
• Versatile partial threading allowing both threaded and unthreaded sections for flexible application requirements
• Industry compliance assurance meeting ASTM A574 specifications and environmental regulations including RoHS 3 & REACH

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical engineering solutions for industrial machinery, heavy equipment, and structural assemblies where high tensile strength and corrosion resistance are paramount. The 3/4"-16 UNRF Class 3A fine threads provide superior clamping force distribution and vibration resistance in dynamic applications, while the partially threaded design offers precise positioning control. The 5/8" hex drive socket head enables high-torque installation in confined spaces, making these industrial fasteners ideal for critical joints in manufacturing equipment, automotive systems, and construction machinery where failure is not an option.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit ensuring precision tolerance. Features 3/4"-16 UNRF fine threads with minimum 2" thread length on a 7" partially threaded shank. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The black-oxide surface treatment on alloy steel provides additional corrosion protection while maintaining the 170,000 psi tensile strength and Rockwell C37 hardness required for demanding industrial applications.